John, Simply de-cock your hammer, then use a proper diameter brass or nylon punch and PUSH, don't smack, your hammer pin out. remove hammer, then repeat for the trigger. Take care to note the orientation of the springs, make sure you put'em back in the same way. remove the original safety lever, replace with new one, assemble in reverse order. AR's aren't all that complex, and very little to be afraid of except the 3 detents and their springs, they tend to go flying!
Ken