I just ask whatever model I'm using, mostly GPT these days, to do the thing. First I discuss a plan of action and then go back and forth with it to settle on one. This is usually a long process and for complex features may even take a day or two. And then once I am satisfied, I ask it to implement. I skim over the code, it often generates too much code for my liking. I sometimes ask it to change things that I dont like. This is almost always to do with bad tests or not using existing code paths. I just work on one thing at a time.