I literally stopped watching the video when he kept harping on the importance of buying a pi with pre installed OS. if you don’t have the skills to flash a raspberry pi you don’t have the skills to do the rest of this build. It’s not rocket surgery.
I didnt have a problem using a PIR for the five that I built. It was over two years ago so I’d have to check the exact code I used. But if I remember correctly I couldn’t get the tvservice function to work. I will happily share if you are intrested.
Depending on where you live, you may have a community workshop/maker space nearby. Some libraries have them, too. I’m sure you could get a day pass and get everything done relatively quickly if you came prepared.
That being said- you wouldn’t need to spend much on tools for such a straightforward project if you are willing to keep the design simple . Home Depot sells a basic mitre box with a saw for under $10. Glue, sandpaper, nails, a hammer, wood filler and paint are all you would really need. If you are ok with painting the frame, it is something you can easily do with barely any tools and no experience.
If you want it to be wood grain, that requires a lot more precision, experience and skill. It is something that could still be done with basic tools, but the tolerances are a lot less forgiving. Even with a good set of tools, I struggle with making perfect frames.
Bottom line- don’t let the frame keep you from doing this project! If you get the basic tools, just buy some extra wood and practice. The extra cost would be pretty negligible.