If you have a freezer, it's not too bad. First you put the hide in a frame, let it dry, then scrape the meat, fat and membrane from the inner side of the hide. That takes about a day and a half. Then you soak it in water with some lime if you have it for three days. You really want to find some lime. Then you scrape the hair off. That takes a couple of hours. Then you let it partialy dry overnight and the next day you get those brains, you know, the ones that have been sitting in a bucket of water for the last five days, mix the brains up until it is just a soupy liquid and rub them into the hide. Then you keep working the hide by stretching and rubbing until it is dry. They you make a cone about three feet off the ground (1m) and build a very small, very smoky fire under the hide. The more you smoke it, the more oils it will absorb and the softer and more waterproof it will get. The smoke also gets rid of the smell of the brains. When you wear it, it will soak up the oils from your skin and lose all the smells except the smoky one.
It's not too bad, but it's not somethig I want to repeat, either. Next time, I got some lime and froze the brains, there wasn't very much smell then.