A couple of years ago I used a guy named Peter who was recommended to me by my parents. His company is called
Custom Door Works.
He came and installed a new garage door opener that I had purchased separately (he recommended buying it at Home Depot because it was cheaper than his cost). And the installation cost about half of what I was hoping to pay. He seemed thorough and the work was done well. He even took away the old one for me for no extra cost.
My folks and my sister have had him do work before (including my dad's spring a while back, IIRC), and I haven't heard a negative word from any of them.