Before you start: make a plan on how you are going to do it. If you have enough confidence after that then just start, because you can't foresee everything you will encounter. Have a little bit of faith in yourself.
During this project I sometimes had to teach myself new skills, I encountered problems that I did not foresee and I sometimes have left things to rest for a few weeks if I couldn't solve them at that time or even worse: a part simply had to be redone because it did not function as I expected.
I am available for questions and advice, even when you are in the process of drawing up your plan.
As long as my hours don't get out of control, my time and attention is free.