Dumb question...

I read from this forum that when you pick up your new vehicle for the first time from a dealer, the tires are over inflated by as much as 10 psi.

My question is, is there a right way to deflate that 10 or so psi?
When I pumped air into my previous vehicle's tires, if one was over-inflated, I used my pressure meter to occlude the tire valve loosely so the air can come out, albeit slowly. I don't really mind the waiting to get the accurate result but was wondering if this method is ok for the vehicle.

Thanks!