Hey, I've got one of those started with camo yarn to use in our camo camper. I haven't worked on it for awhile but hopefully will get it done before winter.
One thing that has helped me is that I put a stitch marker everytime you have to switch between knitting and purling. Place one color for knit and one for purl. Trust me this will save your sanity. Some people may
but ya gotta do whatcha gotta do.
I agree with Ingrid--a swatch isn't necessary.