Driveshaft shortening

Im kinda weird when it comes to stuff like this. I enjoy doing stuff myself I take pride in it. So far the only thing on my car that someone else has done is the machine work. I want to try to do it just to see if I can. If it works I will know I can do it and it will be one more thing I learned to do. I'm gonna try it if nothing more that to move the car around in the yard with. Who knows it may work just fine and I saved myself 200 bucks lol