I'm one of those "crazy" ole timers that firmly believes there is a difference between dry and seasoned Osage, so the longer the better. My book, it's very early to start on it, but, if you got the itch and it must be scratched, trace the outline of the back onto something and start working towards floor tiller. If you see it taking any set, leave it for a month or so and then try it again and monitor any set. If it takes set at that stage it's to wet. If not, keep going till it does. I think, as stated from the start that waiting is optimal, but the thinner you get it the quicker it will dry and maybe the quicker it will season as well. As long as you see no set carry on.