I've seen too many cross threaded oil pan plugs, over torqued oil filters, short filled or overfilled oil levels, and just plain ignorance to trust any shop with the maintenance of my vehicles. I have shops do the stuff I don't know about like axle gears, wheel alignments, and stuff that's a serious PITA. Otherwise, I learn about it and do it myself, like the lift and TC work!
Edit: A factory service/repair manual is your best friend, and worth every penny!
The difference between stupidity and ignorance. Ignorance is doing something wrong and not knowing better. Stupidity is knowing better, but doing it anyway. Don't be stupid!