I backed into some idiot trying to go around me while I was backing out of a parking space at an Orlando meet in Feb. Called up Merlin at St Charles and he had the rear bumper cover to me in 2 days. Hardest part are the two bolts on each side that are covered by the cladding on the rear quarter panels. I pried them up and used a Mag light to hold them off the cladding, then used a small socket with a torx bit taped inside to back out the bolts. Of course I had to make the cut for Tone's hitch, but that's pretty easy the second time. Wasn't too bad. I don't remember what the exact cost was (seems like the $230 that John mentions above is correct - shipping was free).
Depending on where you hit it, the tubular bumper supports could be dented or bent. You may need to have that straightened or rewelded. In all, you should still be able to do most if not all the work yourself. If it's real bad, you may want to get someone at a body shop to take a look (to make sure you didn't do any structural damage). However the VX is made really tough and I doubt if it's been made unsafe from backing into something.
-- John