Lots of home owners are looking online for garage door opener replacement parts in order to do repairs on their own garage doors. Before you buy any new parts, it's important to understand what parts of the garage door are safe to work on for amateurs and non professionals. You shouldn't touch anything that involves the springs. Particularly when the door is lowered, these springs are under a huge amount of tension in order to help raise the door when you need to get into the garage.
People have been killed or severely hurt by a spring that breaks or gets loose. You should also avoid the motor itself unless you are skilled in electrical repair work. When working on the frame and garage door rollers, be careful since both of these require precise alignment that may not be obvious to someone who has not installed or repaired these doors before.
Jobs that you can do involve changing batteries in a remote control opener or moving a wired opener around on the wall. You can buy replacement garage door opener parts online and can consult the manual that came with your garage door for specifications and part numbers so that the new parts match and work well with your existing door. For more complicated repairs, it's wise to consult a professional who has experience with these doors. The best person is probably whoever originally installed the door since they will probably be familiar with the setup. If you don't have their contact information, ask around for a trustworthy and inexpensive door service company.