There's a limit to what's safe to do alone here. If the door is only a few inches off track and nothing looks bent, you can sometimes reseat it by hand after disconnecting the opener - pull the release cord, lift gently, and see if it settles back into the channel. If it doesn't move easily, stop. Forcing it risks the spring system, and a torsion spring under load is not something to fight with by hand. What you can do yourself: check whether the rollers look worn or cracked, note whether the noise is coming from one side or both, and clear anything blocking the track before we arrive. That saves us time on site and saves you the callout for a problem you could see coming.