That approach is better done with 20 Mule Team Borax than salt. Salt will constantly attract and hold moisture. Check out the link for tanning kits.

http://www.vandykestaxidermy.com/Tanning-Kits-C18.aspx

Personally i would just send it to a tannery. I tried tanning my own squirrel and coon and neither turned out so next fall im just sending them to tannery because it will be around the same cost without all the hassle.

Beekeeper is right. Borax,boric acid paste. You have to make sure to lean the hides a little to allow the moisture drain off and pat them dry with paper towels. Once they are fairly dry you can break them down by rolling them in saw dust. Small hides can be tumbled in a shell casing tumbler fairly well. We used to use an old dryer with the heating eliment removed and wood shelves put inside drum to keep the saw dust from falling into the drum holes.

I had ambitions to tan a deer hide "fur on" as a wall hanging. It didn't turn out so well.

I salted the skin immediately and followed directions on a bottle of some kind of "tan it yourself" product. Nothing I did was really working and once the skin hardened I couldn't "break it" effectively by working / beating it. Soaking the skin again only loosened the fur which I then had to scrape off.

I ended up with a good "half tan" hide that was useless to me. I gave it to a fellow who makes instruments for Native American drummers. he was pleased to get it and I believe his project turned out better than mine.