Cool boat! I'm a first time poster to this site but I've picked up a lot from reading.
My first major project was carpeting and I used this as a guideline https://www.tinboats.net/projects/4-installing-boat-carpet. I've installed a lot of stuff on my rig since (rod holders, cleats, lights, etc) but I'm most proud of the carpet job. My keys on carpeting: buy construction paper and masking tape to make a template; place and draw the template in the back of the carpet with grey marker, and cut carefully. It will be tedious but rewarding if you do it right.
The comment on correct tools is absolutely right. If you have the correct tools it will save you a ton of time. Don't try to take shortcuts and don't try to force things in.
Most of all, remember the project is yours. You will make mistakes but keep moving forward and the boat will turn into your baby (at least mine did).
~M27