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Rollers are a cakewalk. I replaced them with nylon ones and the noise reduction was incredible.
Few months ago, one of the torsion spring snapped and it shook the house a bit, believe it or not. I youtube'd a bunch of videos on how to replace the torsion spring and it was very straight forward. Ordered $15 torsion bars on Amazon and the pair of springs from a reputable online dealer. Arrived in a few days. There are some other parts which you would want to replace while you're in there.
Overall, it was very straightforward. The hardest part was sanding down the rust from the 1" diameter bar to get new bearings in. Everything else slid into place.
The thing you have to remember is not to stand in front of the spring as you're winding it. Should those winding bars come loose for whatever reason as you're working the spring, it could be fatal
Youtube it. If you are cautious, there's nothing really to worry about. Obviously, don't unscrew the torsion spring bolts without having the winding bar locked in place. Common sense. Same thing with putting a car on jack stands before getting under it.
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