This is a procedure that use to be common place awhile ago. Don't forget you can still use it subject to company and airport restrictions.
I use it all the time, blinding bit of fun and can get you out of those awkward corners.
The key to it is to roll forward a little first then go into reverse thrust. Trying to do it from a standing start you will blow the terminal away.
Once it's moving backward ease off on the power but making sure it still in reverse thrust.
Don't stamp on the brakes to hard either. If you are light just going to forward thrust will stop you smoothly.
Must have somebody to Marshall you though. Hand signals are confusing *grin* Enjoy.