I don't want to come off as rude but there are plenty of threads here on the topic of roof raising.
I would recommend looking at some, get an idea of what needs to be done and yes, then ask questions.
I myself have done two roof raises, really not that hard but it is labor intensive work for sure.
If you can do simple welding then you can do a roof raise but I would not try it without reading some of the threads here in the forum.
Here is one of my threads, there are many more really good ones here...
https://www.skoolie.net/forums/f10/r...der-24890.html
No "ONE" method is right or wrong, just different ways of skinning the cat.
Whatever route you take, read the posts and get sum freee edumecation !!!