I became a DYI'er many years ago, after having dealt with several different mechanics and dealerships and having them at one time or another try to rip me off. An educated customer is dealerships worst nightmare.
Several years ago I had taken one of my vans in for warranty work and wanted to take advantage of an $8 tire rotation. I picked the van up at night, and the next morning I noticed the tires weren't rotated, (I had marked them). Giving the dealer the benefit of the doubt I called and asked if the tires were rotated. The natural response was yes, I said are you sure? "Yes the mechanic is right here, I asked him". "I said that's funny I marked the tires and they weren't rotated". The reply was, " s*.*t he marked his tires". They told me bring it in and they'll rotate them. I said give me my $8 back, and that was the last time they saw me.
Several years later I went to work selling cars. I changed dealerships 5 times in less than 4 years. Having management invent ways to take commissions back from me was making me sick. Funny how they treated the top salesman. The shops were no better ripping people off. I had some good times, but didn't want to participate in ripping people off, it was encouraged. After working in 5 different stores I got tired of trying to find someone honest to work for, and went back to the business I left. I'm sure there's a good dealership somewhere, I just didn't want to spend half a lifetime trying to find them.
On a positive note I found a mechanic I can trust and he will be seeing me for projects I'd rather not tackle. Local independent that appreciates his customers, he's worth his weight in gold!
Frank D