Will agree that if you can do it yourself, it's the way to go. Find a good service manual, a few good youtube videos, and most tasks are easily completed at home with basic tools. Added bonus of a gained sense of satisfaction and an expanded skillset after completion.
With that being said, I recently got screwed by a local AAMCO. +1 to those who have noted to stay away from the national chains. My 01 Tacoma started making some unpleasant noises from the gear box. I don't have the time to learn how to rebuild an auto transmission, so I took it to a shop. Was quoted $2300 (reasonable price for an auto transmission rebuild), so I authorized them to pull the transmission ($890 deposit- first red flag).
Next day I get a call saying it's going to total $3700. I went into the shop and talked to the manager and owner- neither could provide a reason as to why my rebuild was going to cost $1400 more than quoted. Labor alone was $2100 - and this was their "standard # of hours for this tranny"- at this point it was clear to me that with labor and parts it was NEVER going to be close to their quote. They acted like it was no big deal for a job to cost 50% more than a quote. They started blabbering about the cost of business going up each year... sure... but did it go up 50% in 24 hours? I don't think so ****************.
Classic bait and switch. They already had $890 out of my pocket so I was stuck with them unless I wanted to walk away with $890 already lost and with no repair. Makes me sick to my stomach that I got caught up in that scam. After talking to some friends and family who live local, turns out this shop has a bad reputation... Still losing sleep over this one.