I did replace the voltage regulator myself. Getting the alternator out is the tough part. And because the repaired voltage reg. didnt fix my problem, I had the pleasure of taking the alternator out a second time. The first time took me most of the day. I pulled the alternator the second time and it took 40 minutes. If your handy with tools its probably a 6 on the 1-10 scale. Installing the new voltage regulator is not difficult either. But I had trouble getting one of the 4 screws off/out that hold the cover plate on. I found that an impact air wrench worked best cause the screws have some locktight liquid holding them in place. I also used the impact wrench to get the pully nut off the pully.
What other question do you have?