You finish by finishing features. Not the whole thing. Can you edit a web page with your web page editor? If yes, congrats! You finished it. If not, focus on th

You finish by finishing features. Not the whole thing. Can you edit a web page with your web page editor? If yes, congrats! You finished it. If not, focus on that first. Also if a lot of architecture is changing, you might have put in too many classes and abstractions? Look into data driven design. Think about data and how that needs to be caressed to get what you want. Think in features. And think in data. That's my two cents.