Everyone started out asking questions, didnt they?
It maybe beyond someones skills to perform trigger work, but if you don't try you will not advance your knowledge or skills. Most of my skills where developed through trial and error, if I got in over my head (key part) I would back off and seek the help of a qualified gunsmith.
Perhaps starting off with a semiauto is not the best idea, but one way to aquire info regarding trigger work is look for a gunsmithing book. It may not have specifics, but it will have gereral knowledge that will be helpful.
Just my opinion.