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Halo - we just did our first couple of roos this morning. I knew we needed a very sharp knife to slit the throats so we made that cut with a very sharp utility knife. I liked the weight, and the short blade length for that. My son does construction and has some high quality, super sharp blades that we "stole" from his tool box. For the rest of the process we used an old boning knife that has been sharpened so many times that it is basically a very thin filet knife. Depending on your skill with a knife, you may want something heavier to get through the neck. DH is a former butcher so his knives are super sharp and we used one of his heavier knives for the neck. Also, we used an older knife for the gizzard knowing there would be gravel in there that may dull a knife and DH didn't want to use his good knives for that.
So, I guess my answer is technically, yes, you can get by with only one knife. Practically, you may want more. One way to know what knife to use is think about what kind of knife you use to cut up a whole chicken you purchase from the grocery store. I use the old boning knife because it fits my hand, I like the length, and I like that the blade is thin. DH thinks I'm crazy, and prefers a larger knife. Of course, his hands are larger.