Ive put a lot of triggers in, the G is a little more of a pain than a standard mil spec, getting the hammer pin in what a little tougher for me, due to the shape of it.. but Its still easy. I put mine in, on my couch in 10 min or less.
Put trigger in, put pin in hole.. set hammer springs correctly in, push down and towards the barrel, put pin it, DONE! I believe they even come with a temp holding pin for the trigger/disco, which helps a lot.