904 Floor shifter conversion questions/help

If you want to keep it in that range I would seriously consider the shifter bighammer recommended or something similar. The reason I say that is the shifter you have selected, I don't "think" has any reverse lockout provision, meaning you could accidentally shift into reverse when moving forward.

And yes, you can do this yourself with ease if you are mechanically inclined and can follow the directions. The one thing you will need is a hole saw mounted on a bit so you can put the hole in the hump to run the cable through, other than that a few simple hand tools. A little time and patience to get the cable adjusted perfectly and you're good to go.