First, know which parts you have to lubricate. These should all be included in your regular maintenance schedule. Springs: The springs that help lower and lift your garage door should be lubricated regularly.
If it's higher than four feet off the ground, or lower than three feet, you'll know it needs to be realigned. Use a ladder as a brace to keep the door safely open while you're working on it. This also takes the pressure off the springs so you can inspect them for rust and warping.