Good stuff posted already...
just a tip to add...when you have it field stripped the hammer will be cocked, and you WILL be tempted to press the trigger...DON'T. It's never a good idea to let the hammer fall and strike nothing but the frame/innards to stop. It's a quick way to bash bits/parts.
You can manually arrest the hammer fall when it's field stripped...but save that for later when you're more familiar with it.