Yes I bought a B&w Turnover ball hitch, and I did do the install myself. The hitch is very well made, and to everyone who had it installed, you just can not appreciate the quality and stout design unless you bolted it together yourself.
The hitch does come with instructions, they may not be the best in the world, but they will get you thru it. There isn't much to it unless you have rear mods, like air bags and some traction control bar (like I had) to get in the way.
First thing to do is get yourself a 4" hole saw and a mandrel (make sure you buy a good one, the cheap crap isn't what you want for this job, something like a Greenlee, or Milwaukee bi-metal). I used a 4 3/8" it worked perfect and it is a size that is readily available. Also you will need a good 1/2" drill motor, I used a 1/2" right angle by Milwaukee, it needs to be a slow speed drill.
Next remove the spare tire and get it out of the way. You will be doing yourself a big favor.
Find the center of the bed going across(you can go with the center of the bed between the wheel wells), the instructions will give you a measurement from the back edge of the bed forward. This measurement will place the center of your hole 8" forward of the center of the rear end. Now you should have a cross section and know where to drill. There is nothing under the bed to worry about, the area is clear, so you will not hit anything. First drill just a 1/4" hole at the intersection, then put on the hole saw and slightly till the drill to one side, this will help. Keep a tight grip, as you go thru there are ridges in the bed that the hole saw likes to catch on. There you now have a big old hole in your nice truck bed.
To hold the center section up while you insert the cross members, I took and ran a chain to the center section and used my engine lift to hold it up in place. If you have help , I suppose they could also hold it for you. Then just bolt everything up and do a final torque.