My own advice is to Proofhide both sides liberally before putting the saddle on, then do another application like every other day for a week or two of riding, then slowly less often until it feels totally confortable and you can see sitbone dents- eventually just once every other month or so. Do not continue to ride the saddle if it gets sopping wet in the rain! Let it dry before riding again.

Expect to feel some soreness for the first few rides on a new Brooks- your butt actually adapts to the saddle as well as the other way around.