Garage door repair can be a daunting task, but with some basic knowledge and effort, it doesn't have to be so hard! First off, you should always call a professional if the job is too difficult for you. It's not worth taking the chance of doing damage to your property or hurting yourself. If the problem is something simple like broken springs, however, then you may want to attempt to fix it yourself if it's within your skill set.
Start by making sure there's no power going to the door opener; unplugging it or flipping the circuit breaker will do this. Next, take off any covering panels and inspect the rollers and tracks for any debris that might be causing an issue - remove anything that could be blocking them. Then check out other moving parts such as pulleys and cables; make sure they are securely fastened and don't show signs of wear and tear. Lastly, test out the door opening/closing manually - if all looks good then you're in luck!
Moreover, if you find that replacing parts is necessary then go ahead with caution; make sure to get exactly what you need from a licensed retailer so that everything fits properly. Also remember never to lubricate certain components without consulting a professional first! Above all else, safety should come first when dealing with garage doors - so if at any point in time things become too complicated or unsafe; don't hesitate to call an expert for help!