That's why my favorite trigger to work on is on Mosin Nagant Rifles...
Any trigger job that starts with...
Step 1..."Take an empty beer can and...." is for ME
Also I too have worked on MANY guns, and have screwed up more than several along the way. BUT EXPERIENCE you always PAY for, one way or the other....
But the cardinal rule I have learned working on guns, or cars, or anything mechanical, that is the BIGGEST one for me to remember EVERY time I putz around with ANYTHING....
"It is always a HELLUVA lot easier to remove just a LITTLE metal at a time multiple times and keep checking until you are ALMOST where you need to be, than it is to put the metal BACK if you remove or cut off too much the first time, or ever!"
Violating THAT rule has cost me more time and money and heartburn than just about ANY other....