Does your garage door close part way then reopen? Does the door bind and stick? Are there scraping sounds as your door opens and closes? In my 30 years servicing garage doors I have found these symptoms to be some of the more challenging for do-it-yourselfers to diagnose. One major cause of failure for garage doors using extension springs is that the pulleys wear out.
I'm not a professional, but I watched as my garage doors were serviced last year. The tech used a spray lubricant (I had bought a different brand in the garage door section of a home improvement store). He sprayed the inside of the entire track, top and bottom, the rollers that ride along the track, and all hinges on the door. He sprayed each hinge twice -- once on each side. The techs were more generous with the lubricant than I was when I'd done it before, so don't be afraid to give it a good squirt.