If one is comfortable replacing struts in their car using spring compressors, you are probably qualified / competent enough to replace torsion springs.
It's not without danger, and I wouldn't do it alone the first time doing it. But I've done it before and if one does their research in advance to get the right replacement springs, and takes their time using the right tools, it can be done.
I stepped up to a slightly more robust spring and put a 1/4 to 1/2 turn less into each one to hopefully give a bit more life to the springs. I.E. the next step up in weight spring.
The hardest part is getting the right number of turns on the drum so the cable doesn't go slack when the door goes up.
It's not without danger, and I wouldn't do it alone the first time doing it. But I've done it before and if one does their research in advance to get the right replacement springs, and takes their time using the right tools, it can be done.
I stepped up to a slightly more robust spring and put a 1/4 to 1/2 turn less into each one to hopefully give a bit more life to the springs. I.E. the next step up in weight spring.
The hardest part is getting the right number of turns on the drum so the cable doesn't go slack when the door goes up.