Youtube sent my previous video to the adult section, so I edited for all audiences. Hope you find it helpful

Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Any knife will dull, even good ones. If you're going to butcher a bunch of birds, you either need to learn to sharpen quickly, or have a bunch of knives. I use a couple of cheaper coated utility knives, and keep a sharpener/steel on hand and sharpen as needed. I use one knife for the initial cut, and it gets sharpened/steeled every bird. The other ones get used past that point, and get sharpened as needed.
I don't use poultry shears like Ridgerunner does, but I keep a large cleaver on hand for dealing with bone. I tend to keep my birds whole until I want to use them - although thinking about it, breaking them up isn't a bad idea.
I had to self-teach - but I found this book extremely helpful/useful - not specifically for poultry, but just kind of on the tools required, how to set up a workstation, tool maintenance, and the thought processes involved - why you cut where you do- I bought it more because it has a huge section on sheep and goats, but it's a great resource.
http://www.amazon.com/Butchering-Poultry-Rabbit-Lamb-Goat/dp/1612121888/ref=tmm_hrd_swatch_0?_encoding=UTF8&sr=8-1&qid=1414177410
Did you find the "R rated" that bad? Youtube forced the video into the adult only section. Thought that was a little overboard.Had to make an account after watching your video (Went to the "Unrated" version) and have to stress what you said about having a sharp and proper knife. For people both in regular cooking and butchering I have seen go with the $25 chef knife from the grocery store thinking that is their best option for a reasonable price but I am sorry they are usualy crap and lose what edge they have very quickly.
Look torwards bushcraft knife companys like Morakniv where you can buy a $9 knife like the Craftline Q Allaround model that has a razor edge or a little less disposable model from them or other great knife company's that can be easily maintained with a fairly cheap wet stone/strop for a life time with a little practice.
Also as far as the cutting if you cut right behind the ear at the jaw line you avoid the feathers entirely for the most part, With a good knife cutting in that spot you almost have to hold back from cutting too deep which is a good problem to have IMO.