Yeah, they are easy - at least mine was. Most aftermarket bumpers are totally bolt on - unless you're hard core and want to tie them in to some kind of fender protection. I would guess 2 hours max. on the install - even if you haven't done much wrenching before.
Most tools will be standard, but the stock front bumper bolts on mine needed a Torx bit.
2003 Bright Silver Rubicon
285/70/17 Goodyear Kevlar MT/R's, OME, DIY bumpers/roll cage upgrades,
Champion beadlocks, 33Eng BellyUp w/CV shaft, JKS BL&MML