i'm not sure about the front, but look for nuts at each of the bumper mounts and at each side mount.
the rear has either 8 or 12 nuts, again at each of the 2 main mounts and on each side mount. to remove the rear bumper, you'll have to pulll out alot of the trunk lining materials as the nuts can only be accessed from inside the trunk.
to get the chrome strips off, you have to remove a whole whack or stamped metal retaining clips and then they pop off...i think...
the impact strips require a screwdriver and patience to work each of the plastic tabs free so you can pop off the strip.
NOTE!! pay attention to how the foam pieces fit inside the bumper, they can be confusing to put back in if you are careless.
just be patient and think your way through the process and you should be fine.
Oh...re-mounting the bumpers will be MUCH easier if you have someone to help you. it's been a while since i've done this and i've only done it once, so my instructions may be off somewhat, but you get the basic idea.