As far as knives go, I use the following:
The Buck Woodsman with its narrow blade is great for cutting around the anus and then later cleaning up the inside of the body cavity. It handles well, and I have a lot of controll of the blade with its smaller size. I find the larger "hunting" knives can be unwieldy, Besides, I'm not field dressing moose!
http://www.buckknive...&productID=3037
I also use the Buck to make a small slit just below the breast bone between the rib cage so I can fit the E-Z Zip in and open them up for gutting.
http://www.gerbergea.../E-Z-Zip_459242
This is by far one of the best items I have ever purchased for dressing game. It literally "unzips" the animal with ease, and I have never nicked any of the organs using it. The best part is, the blade is replaceable, and it uses standard utility knife blades.
Hope you find this helpful.