Yoshi
Invictus
I'm a Glock-certified armorer until June this year. I took Glock's course to become "certified" but--I had already learned everything they taught in the course from PTOOMA's Glock manual.
Yes, it is easy. And, if you experience trouble, there are plenty of folks willing to help.
A fellow student at a class I recently took had a self mod-ed Glock ... it was no longer reliable
I've heard about the PTOOMA Manual. I guess it doesn't matter that the material is a bit dated?