Jack T, I install overhead garage doors and electric operators. Also install storm doors but garage doors is my main gig. 
Heh heh.    I was just messing with my opener and door last night.  Didn't need a professional though.
That's good to know.
When I moved into my new house in 1998, I bought two openers from Home Depot.  I had my dad down to help install them.  He took one look at the directions and said, I'll pay to install one of these if I don't have to do it.  I said, Done.  And then I had Home Depot install them.
Art