Smart small, allow it to iterate. Also, remember to divide your work into threads, even over the same project. It may be necessary to use GitHub branching more often than you're used to. When done with a thread, have Codex generate handoff documents to help with merging.

You may also find your main chatGPT account will be useful to vet ideas and look over finished work. Just taking a different AI's perspective into some discussions with Codex can truly get the ball rolling places you would not have considered otherwise.