[SOLVED] Django Multiple Form Processing in same View

I am looking for some assistance in two areas for Django form processing.

I have a class view that overrides post() and checks the name of the form in request.POST to determine which form has been submitted. I then perform the appropriate actions for whichever form was submitted and save to the model. That part works correctly. I am not using a model form, just a custom HTML form created in the template with <input> fields. See the below view and HTML for reference. Is this the correct way to handle this or is there a best practice I should be following that makes use of model forms? Code seems a bit heavy to me and non-standardized, like there should be a better way...
As I am not using model forms, the error processing has me a little confused. How do you handle error processing on a normal HTML form that does not make use of Django model forms? See below in the code for the view where it says # ERROR HANDLING FOR FORM NEEDED, specifically on the username field, which is unique and validated on the model level.

views.py:

 class ProfileView(View):

   def get(self, request, *args, **kwargs):
        if request.method == "GET":
            # load profile data...
    
   def post(self, request, *args, **kwargs):
        
        if request.method == "POST":

            # check if profile_form submitted
            if 'profile_form' in request.POST:
                # get user form data
                profile_data = request.POST.dict()
                # get current user profile
                user_profile = Profile.objects.get(my_user=request.user)
                # check username entry against current
                if user_profile.username == profile_data['username']:
                    user_profile.country = profile_data['country']
                    user_profile.display_location = profile_data['display_location']
                    user_profile.organization_name = profile_data['organization']
                    user_profile.save(update_fields=['country', 'display_location','organization_name'])
                    #send success message to page
                    messages.success(request, "Success: Profile was updated.")
                else:
                    try:
                        user_profile.username = profile_data['username']
                        user_profile.country = profile_data['country']
                        user_profile.display_location = profile_data['display_location']
                        user_profile.organization_name = profile_data['organization']
                        user_profile.save(update_fields=['username', 'country', 'display_location','organization_name'])
                        #send success message to page
                        messages.success(request, "Success: Profile was updated.")
                    except:
                        # unique constraint error on username
                        # ERROR HANDLING FOR FORM NEEDED


            # check if user_name_form submitted
            if 'user_name_form' in request.POST:
                # get user form data
                user_data = request.POST.dict()
                # get current user
                user = MyUser.objects.get(email=request.user)
                user.first_name = user_data['first_name']
                user.last_name = user_data['last_name']
                user.save(update_fields=['first_name', 'last_name'])
                # send success message to page
                messages.success(request, "Success: Name was updated.")
            
        # Return Profile page view with updated data
        return HttpResponseRedirect(reverse('profile'))

Template:

<!--form-->
                <form id="profile" class="small" method="POST" action="{% url 'profile' %}">
                {% csrf_token %}
                    <!--Username-->
                    <label for="username">Username <span style="font-style: italic;">(create a unique display name that will appear to other users on the site)</span></label>
                    <div class="input-group mb-3">
                        <div class="input-group-prepend">
                          <span class="input-group-text" id="username">@</span>
                        </div>
                        <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="username" name="username" value="{% if profile and profile.username is not None %}{{ profile.username }}{% endif %}">
                    </div>
                    <hr>
                    <p>Tell us where you are from!</p>
                    <!--Country State/Province City Select-->
                    <div class="form-group">
                        <select name="country" class="form-control mb-3" id="country">
                            <option value="">Select Country...</option>
                            {% for country in countries %}
                                {% if profile.country == country.name %}
                                    <option value="{{ country.name }}" id="{{ country.code }}" selected>{{ country.name }}</option>
                                {% else %}
                                    <option value="{{ country.name }}" id="{{ country.code }}">{{ country.name }}</option>
                                {% endif %}
                            {% endfor %}
                        </select>
                    </div>
                    <hr>
                    <p>Enter your profile display location <i>(ie. City, State, Province, Region...)</i></p>
                    <input type="text" class="form-control" id="display_location" name="display_location" placeholder="Based in..." value="{% if profile and profile.display_location is not None %}{{ profile.display_location }}{% endif %}">
                    <hr>
                    <p>Do you belong to an organization?</p>
                    <input type="text" class="form-control" id="organization" name="organization" placeholder="Organization Name" value="{% if profile and profile.organization_name is not None %}{{ profile.organization_name }}{% endif %}">
                    <hr>
                    <button type="submit" class="btn btn-primary" name="profile_form" value="profile_form">Save</button>
                </form>