I would add to this that you shouldn't be afraid to refactor when you hit a wall where you can't add the feature you want to add because of the way the other fe

I would add to this that you shouldn't be afraid to refactor when you hit a wall where you can't add the feature you want to add because of the way the other features structured your code. Better to take the time to modify the basic structure a bit to make it work than to try to kludge something together to sort of make it work. You'll find that doing it right allows other features to be added that you haven't thought of yet. If you somehow force it to sort of work, you'll end up doing that for a lot of other features, too.