The front bumper is easy, i removed it from the front four bolts off the bracket and just the two bolts on the frame and kept the side bracket attached. I just did a facelift to my bumpers. The rear one was a pain but he is correct, easier to remove it with the brackets.
I ordered new metal pieces since my originals were so rusty from previous owner dropping his boat off in salt water. But I kept all plastic and rattled canned them with the duplicolor bed armor, just like i did my grill.
if you want to know the paint process for the plastic just let me know