If you're gonna do it, do it right. Normally I'd recommend getting a gun-tech to do it, but seeing as how there's a bunch of you and you're fairly remote, it may not be a bad idea to learn. There's some decent YouTube videos on mechboxes and shimming, etc, also there's tons of reading on how to clean, grease and what products to use and where to get them. Having a practice gun is good, but make sure you understand the goals of fitting each piece, it'll make the whole thing a lot easier. Do it in a room/space where when things explode (and they will) you can find all the tiny springs and parts and crap. Nothing like loosing your anti-reversal latch spring when you're almost completed the mechbox and now you can't move on.
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