icehunter121, good on you to take on such a fun project.
There's some essential reading which you'll want to find. The theory isn't too complicated, but sometimes the execution brings problems, frustration and questions. (ask me how I know that...). Take your time, go step by step. A finely bedded Lee Enfield can often produce some pretty tight groups. (ask me how I know that...)
The No4 and the No1Mk3 forend beddings have very different requirements. Read about both. (it's fascinating and very classic british engineering...)
For the No1Mk3, the key information is found on page 15 in the "Instructions for Armourers 1931 Part 2 - Small Arms":
https://www.milsurps.com/content.php?r=307-Instructions-for-Armourers-1931-(Part-2-Small-Arms)
For the No4, 7ECA got it right: the 1991 edition of the "First Line Maintenance Instructions", published by the National Defence.
I look at these publications often, still to this day.
Oh and as Sir Plus mentioned, this sticky may provide some useful info too:
https://www.canadiangunnutz.com/forum/showthread.php/1502728-What-questions-to-ask-when-shopping-for-a-desporterized-No4-Lee-Enfield
Hope this helps!
Lou