A torsion spring under full tension can break a wrist or worse if you don't know how to wind it down. That's not scare talk, it's just the physics of a coiled bar storing enough force to lift a 150-pound door - and it's the one job on a garage door we tell every homeowner, in Crofton or anywhere else, not to attempt without the right bars and a second set of hands.
There's plenty you can safely check yourself first. Look at the rollers for cracking or flat spots. Listen for grinding when the opener runs - that's usually a gear, not a spring. Check whether the door reverses cleanly when it hits something on the way down; if it doesn't, that's a safety sensor issue, not a DIY fix, and it's not something to leave for later.
Here's the limitation we're upfront about: if your opener is an original from the late 80s build-out and the logic board has failed, we often can't source an exact replacement board. At that point the honest answer is a new opener, not a repaired one, and we'll say so rather than bill you for a part hunt that goes nowhere.