Oh, i understand.
You need to freeze your hide as I believe you have alot work ahead of you before you tackle tanning the hide.
I used to be buds with a marine who brain tanned hides. Cut the ties when he went head over heels apeshit in love with Oblamer.
Anyway, brain tanning a hide is a very labor intensive process. You need to build a big frame to stretch the hide. You need to flesh it out and then there's the cow brains and you need to be careful handling them. I don't know the process but there's alot more to tanning than I believe you're aware of. If you just flesh it out and salt it, it will rot. The brain tanning is the original way of doing things, and the chemical way of tanning is regulated by the environmental nazis. I'm unaware of tanning 'kits'. Hopefully someone else can help you out, and you need to do your research, best of luck and do report back if it works out.
http://www.fieldandstream.com/node/57386
I just read this, maybe it is easier than I thought...