Well, I can't give you exact details, as I have not done mine yet. I just know the basic steps to do it. You will remove the pump from the machine. The block off plate covers the hole left when this is done. It is actually a simple thing to do from what I have seen. So if you are intimidated for a little worried about how dificult it is, don't be.
You also need to get a new throttle cable. The factory cable splits into two. One for the carb, one for the injector. The new throttle cable is a single, just for the carb.
Both HPD and Hot Seat are good products. The kits is really only a plate and a few screws to hold it on. I personally like the HPD kit better, you get more for your money.
HPD wants $15 for the kit, and $18.75 for the cable. You can see the picture of the kit here:www.hpd-inc.com/11.html
Hot seat wants $20 for their kit.