A torsion spring holds enough tension to break bones if it lets go while you're working on it, and that risk doesn't change based on how handy you are. Swapping a panel or adjusting cable drums on a system installed in the early '90s means dealing with hardware that predates a lot of the safety standards on today's kits - tracks that don't line up with new brackets, lag bolts sized differently than what's sold now. We don't recommend DIY on full installs. Where it makes sense to save money is on cosmetic stuff: repainting a door, swapping a keypad, cleaning tracks. The structural work - springs, cables, the opener mount - is where we tell people to call rather than guess.