Did this veer off from the Push Press discussion? Forgive me if the discussion has changed...
A push press doesn't have a squat portion. Get the bar up to the shoulders via a rack or clean movement, then just dip the hips a bit and use hip/leg drive to "pop" it up to full extension overhead.
No need to worry about special grips or anything, just avoid your chin, nose, etc. on the way up.
