I just recently did this job on my '89, and I can tell you, it is every bit as time-consuming as that 7.5-hour "flat-rate" estimate suggests.
However, it can be done with the simplest of handtools.
I recommend removing the energy absorber (four screws) rather than trying to work from the rear.
Tip: give a small shot of spray paint to the back side of the energy absorber, after you get the bumper cover off, so you'll know exactly where to adjust it to when putting it back together.
Or not.
THe adjustment is not TERRIBLY difficult, and it sure is easy to tell if you get it wrong!
Just remember to keep the LH and RH side shimpacks separate and labelled so you don't have to go through the whole business of sorting out those shims when you put it back together.
You can certainly save a bunch of money this way!
Regards,
R
PS: If you've got a digital camera, I'd suggest taking a few photos of the underhood stuff before you take it apart.