This is an older post, but I'm going to add to it anyway. This is such an important topic. I've heated with wood most of my life, so I have quite a few cords of wood under my belt. I try to remind myself each time I use a saw that it is the most dangerous tool that I use on the farm. It's hard not to just get used to it and think that after all those hours of sawing, that, "you must be really good at it and bulletproof".
In this picture, you'll see the one cut in my chaps which are about 20 year old. It only cut the nylon on the outside, just a "nick". Well the location of that cut is right where the femoral artery is on your leg/hip area - what If I hadn't had the chaps on and what if would have been deeper? Don't like to think about that.
Another interesting point is that I don't know when that happened!?!? One day when I put the chaps on I saw it and though, OMG! After that incident, I made a vow to myself to ALWAYS put my chaps on - even to just make one cut. My rule is no using the saw without the chaps. It's hard to do, but after many years now I have not violated it.