It's always a lot at the beginning. But you'll learn a lot from it in the end.
Definitely watch the videos in the link above, if you pay attention it's a wealth of knowledge.
Also, read the bitbuilt forums.
9 times out of 10 the questions you are asking have been asked before, and you can...
Wii's aren't too expensive on eBay. If you break it, you can always get another.
I can admit that I completely messed up on my first motherboard.
But it's all a learning process. Don't be too disheartened.
In the end, it wasn't on Shanks Youtube. His video briefly shows the internals. But it is not what I was hoping for. :(
So hopefully this helps everyone instead :)
Just takes a bit of research to find what you need. (thank you Shanks Discord)