I think its 50/50 trust and communication. There have only been a FEW instances in which I needed somebody else to do XXXX. I was fortunate to meet a great guy and very good mechanic at that time (400 miles from old home). He hunted the issue for a couple hrs...even told me "i know what your feeling...but i don't know what it is" .. I figured $150....as I questioned WHAT exactly did he check so I could rule out...x,y,z,1,2,3,.....Then as I asked the bill..."I didn't fix chit...i can't charge YOU"..So gave him $50 said buy lunch! The next time (couple yrs later) called him from the house told him send a wrecker...pick up the blazer...call me when you figure out WTH happened....,WE are on the road to Florida! He calls me back 2.5 hrs later...$300 total..ignition died. He obviously fixed it....cleaned it...and delivered it back to the house (3 miles)... Being an honest mechanic does NOBODY any good if they are stupid..... finding some that are both honest and good is sometimes a problem. I think most of us have no issue paying $60 for the oil change (instead of $40) or $12 to replace a bulb (instead of $5) when you KNOW it is squared away, but when you try to smoke someone $80 for the $30 job...its just not going to fly.