This comes up on every torsion spring thread.
Some people have enough skill and sense and the right tools to do it without injuring themselves. Some don't.
I've done it many times, but now have a Clopay EZ-Set system that came with my door so there's very little risk of injury.
https://www.homedepot.com/p/Clopay-E...A-16/207135218
Sadly, any garage door company you talk to wants to charge you extra to replace this perfectly functional system. Just sell me the fookin springs OK?