Dave,
Just a small little story to tell you.
About a year back, I was working on a K5 blazer. I had it supported on the frame by jack stands with the wheels off, however it wasn't sitting high enough to make room for the lift kit I was going to install. I got under it with a bottle jack raising it higher and readjusting the jack stands. I was laying forward of the front axle when the axle tube slipped off of the jack. The frame slammed into the jack stands, and it all rocked forward off the stands and fell. The passenger front disc brake landed on the inside section of my upper thigh. needless to say I was pinned.
I was the only person out there working on my truck, I screamed and yelled in pain and my sister in law (who happens to live with us) came out the front door, saw me under the truck and freaked out. I had to calm myself down so that I could calm her down and get her to function. I had her get my high lift jack, and set it in the center of the front bumper, however she still couldnt figure out how it works and as I was under the truck, I couldnt see what she was doing wrong. I lost faith in her and started to reach for and reset the bottle jack to lift the truck off myself. At that point a neighbor who heard the noise came along and jacked the truck up with my high lift jack. It definately felt like an eternity.
Once the truck was off of me I stood right up, then was told to lay back down, emergency services came and hauled me off to island hospital. Went through all the checks and found out I was very fortunate. I WALKED out of the hospital that night. To this day I have minor lingering issues, but all in all, I am good.
The reason I tell you this story is not for one-ups-manship nor for "fame." I tell you this so that you know that people do walk away from serious crushing injuries. I hope for your loved ones to be as fortunate as I was and you all are in my thoughts and prayers.