As choptop said, the uppers are easy, the lowers are a bit harder. The uppers are a bolt in after you remove the old ones. If they are still the original uppers, they will be riveted in, so you will have to grind/cut the rivets to remove them. Then the new one just bolts in.
The lowers are a pressed in deal, and best left to a professional. Most shops will only charge $10 to $15 for doing each arm, so it is well worth it IMO. The amount you will save in aggravation will more than make up for it!
Colorado Springs, CO
68 Camaro... someday!
71 Chevelle SS