This is a cool project! I usually review docs/blogs/etc. as much as possible and brainstorm with an llm. I research to see if there are any other open source examples that I can also learn from. I find that this does pretty well. At the end of the day, after the implementation, I continue testing and that's where it gets interesting since I'll run into edge cases that creators of the original product already ran into and resolved and over time it helps make the software more robust as I use it and fix it myself.