Where are you located? In Toronto there have been 3 or so AEG workshops hosted at TTAC3 by a user on this forum, M102404. I attended and it gave a lot of insight and practical knowledge on repairing AEG's of all types.
Like most technicians, they either taught themselves or were shown by someone else; There isn't really any other way. Take your time and don't rush. www.mechbox.com
has a lot of information, so do the forums here for unique solutions.
Ár skal rísa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.