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Here is a link with a lot of information to get you going.

www.tn.gov/twra/pdfs/tanninghides.pdf

The more you work a hide the softer it will get, for a strop I would leave it on the stiff...

No brain tanning is what I had in mind...

Do what is considered village tanned. It is not worked as much, it is a touch stiffer when finished. It is what would be used for the soles and insoles of moccasins.