This is a job that you can absolutely do yourself, but there is danger involved when working with heavy doors/springs under high tension. A picture of the garage door would be helpful; there are a couple different ways in which the weight of the door is balanced.

The rollers that slide your door up and down are more crucial to its proper operation than you may think. Be sure to clean and grease/oil these occasionally. The springs may also be the source of the issue. If they aren't lubricated properly, they could stick or even break.

While sagging can occur from uneven door issues, it isn't always the problem. Sagging can also arise from the old age of the equipment or warping. The only fix for a sagging door is to upgrade it. It is essential to distinguish problems in the door to determine if repairs are possible before purchasing a new one.

Some of the most common garage door repairs include fixing broken springs, replacing worn-out rollers, repairing misaligned tracks, troubleshooting opener malfunctions, and addressing issues with sensor alignment or wiring.