Pepper mills
are not hard. Go for it. Practice on a couple of blanks. It is not like pens where you lose the copper tubes if you mess up.
I've made a few. The key is the length of the internal mechanisms, which dictates the length the blank needs to be. There are several ways to make this. Most mills have a turned top, but this one is simpler with the mechanism as the top.
Since they are only recommending to buy one 1" forstner bit, I would suspect that the directions will require cutting the larger bottom opening for the bottom retainer for the grinding mechanism. The way I would make it, as I have made many others, is to chuck the wood piece and make it round. Then put in the Nova chuck, drill the 1" hole half way through, turn the piece around and drill the remaining half. Sometimes when I am concerned with perfect alignment during drilling, I will drill a 1/8" hole through the initial block first, which seems to help guide the point of the forstner bit through the piece. Then with the Nova chuck on one end and jam chuck on the other, finish the outside, making sure the jam is the bottom end. Ensuring the Nova chuck has a good grip, carefully cut the groove for the bottom retainer. At the end, I flip the piece to finish the end that was in the chuck.
Actually, the first time you do this it will take some time, but I find that it just gets easier and easier to turn these things out.
I usually make pens, but I do find that this larger object requires a more substantial finish, so I still apply a shellac base, let it dry overnight, and then apply two coats of spray poly, letting them dry very hard between coats.
Woodcraft has some good directions and drawingsfor their mills. Parts will apply to your mill, but it will also give you some ideas.
http://www2.woodcraft.com/PDF/77B35.pdf Craft Supplies USA also has some fair directions and drawings:
http://www.woodturnerscatalog.com/woodturners/Images/pdfs/deluxe_peppermill.pdf
Good luck.