I only use Tru Oil for everything, gun stocks, self bows, over skins, over glass, ect. There is no wrong way to use it in my opinion.
I bought my last 8oz. bottle off of evil bay which goes against my better judgement but it was actually cheaper than any other place I found and free shipping so you can't beat that.
Some hardware stores carry it, but nobody around me does so ordering it off the internet was my only option.
Be sure to buff with 0000 steel wool in between coats. After 3 coats over skins I sand lightly with 400 grit, then add a couple more coats and sand lightly with the 400 again. That leaves a nice smooth finish on the skins, then you can buff the final coat with steel wool to knock the shine down. I like to wipe it down with some pledge furniture polish after buffing the final coat for a satin finish.