I have been looking for a good mechanic to do some work on my car. I want to find one who will not make things worse.
Yes.  It is a good idea to look for a mechanic who specializes in your particular vehicle.  There are a variety of "mechanics."  But if you should look for one specific to your vehicle.  
Yeah, I wouldn't want a mechanic specializing in luxury vehicles working on my Ford pickup truck.
Yes; and even within, let's say, a Ford dealership, there will be specialists within that department.  Some may specialize with the mechanical aspects of the vehicle, while others will deal with the electrical aspects.  There is so much specialization these days.
For good reason as today's vehicles are much more complicated than the days there were like 7 components of a car. The computer systems alone requires extensive training to diagnose.
Mechanic
A mechanic is an artisan, technician or skilled tradesperson who uses tools to build or repair machinery.
Duties.
Most mechanics specialize in a particular field, such as air conditioning and refrigeration mechanics, auto mechanics, bicycle mechanics, boiler mechanics, general mechanics, industrial maintenance mechanics (millwrights), motorcycle mechanics, aircraft mechanics, bus mechanics, truck mechanics, diesel mechanics as well as tank mechanics in the armed services. 
A mechanic is typically certified by a trade association or regional government power. Mechanics
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