Scrape all the fat off, split tail as far as possible, pack in salt for a couple of days...mix a cup of salt with 1/2 cup alum in a gallon of water, soak hide for 3 days stirring twice a day, wring and lightly rinse, then twist, rub and pull while it dries...it will not be real water resistant with alum tan alone, smokeing will aide in this. Most tanning sites have similar methods which will work from a mouse to a moose for hair on tanning.