good advice, but Brian and I normally agree on everything! lol
The mottled duck might be the worst of them all though. Seeing how they don't migrate, and are in constant molt, they tend to be the worst of all the ducks to flesh. There is always a trade off with thicker skinned birds versus thinner skinned birds. Under normal conditions, the wood duck will have no viscous fat, making fleshing easier. That doesn't mean their skin isn't thin, it just means the fat removes easier, so it takes less pressure on the wheel to remove the fat in the first place. The redhead for example is probably the best choice, but in my experience, they have pretty damn thin skin as well, and their fat sort of melts off. At least the Texas birds I've done that have that milky white fat on them do.
You didn't mention if you have a flesher or not? I think we would all agree that the number one tool to getting started is a fleshing wheel. I can't see how someone could do an adequate job using scissors and a hand-held tool alone? I know it's an investment to build or buy one, but if you really want to give this a whirl, at least give it a fair shake. Once you find out if you actually can hack it, you are going to have to buy an airbrush anyway, so there is the other larger investment you will spend your money on. Beyond that, supplies are pretty cheap, and many can be bought at art supply stores, or hardware stores, where the price hike will not be added, as you will see at the taxidermy supply companies.
As far as fleshing goes, people have their own methods, so find out what works well for you. You could poll 10 taxidermists, and find ten different methods. I like to skin my birds and freeze them in water. I thaw them out, and I flesh them warm and wet with soapy water. I start at the head, and work my way to the tail. This eliminates the membrane from wrapping around the wheel, and the skin is becoming fat free as you flesh, and the limp (fleshed) skin hangs out of the way as you flesh the remaining skin. That certainly doesn't mean my method is correct, but after many years of experimenting, and acquiring the knack to not burn holes and still have a clean defatted skin, this is where I am today.