I replaced my torsion springs a few weeks ago with little drama. The hardest part was measuring the old springs so I could order the correct replacements. The reason I did it myself was 1) the springs used by contractors are typically lower quality and will last 10k cycles vs about 30k for the standard ones I ordered. 2) I wanted to learn how the system worked so I could adjust it as needed and know it was done right and not be reliant on an ‘expert’ same as why people work on their cars 3) labor costs in Seattle area are higher than most other areas. The best video on replacement is https://youtu.be/xOXO01rdZ5c?feature=shared. I used zip ties to hold the cable pulleys and open mouthed bracket in place instead of the vice grips as he did in the video. I did not weigh the door. I did it alone, though probably not recommended. I ordered from DDM Garage Doors. I wouldn’t recommend Amazon vendors as they all look pretty sketch. Definitely order proper winding bars with good rubber stops to help you ensure you’ve inserted it fully before each wind. If you are at all mechanical minded (replaced a clothes dryer drum? ), this is doable. Just go slow and be safe. Took me about an hour to remove the old springs, 3 days to get parts and 3 hours to install including having to repeat the winding because the cables came off during the first try. I wore gloves, safety glasses and during the winding of the springs a bike helmet and an over the ear headset to protect my ears. Probably could have used teeth protection, and a chainsaw type face shield. The dangerous part is tightening the set bolts while the spring is tensioned . If you aren’t paying attention, I can see that it might be easy to bump the bar out of place, releasing the tension and potentially shooting the bolts back at you or the spring catching your gloves and fingers and shredding them.