So my torsion spring on my garage door broke the other day. I recall seeing a torsion spring being replaced at one time and remember hearing about it being a fairly dangerous undertaking for the DIY type. But I am a DIY type and I like challenges. I thought that maybe, just maybe, there was some information on how to do this safely somewhere out on the interwebs. Turns out that there is and it can be found here http://www.truetex.com/garage.htm in an article entitled "How I replaced Deadly Garage Door Torsion Springs and Lived to Tell the Tale".
The author of the page is a super smart person and explains the process and how to do it safely very well. Some of the wording is very technical, but the author is, after all, an engineer. Much of it is fairly entertaining too, especially the scam avoidance section. Bottom line is that it works. By following simple steps and being safe about every move you make, it isn't difficult at all. For about $26 for the new spring, I had it done in about two hours. Still have all of my digits too! Saved me about $200