A good test of your 'feet' is high speed tail-up taxying. Great fun!
Not only is it great fun but it it should be the very first part of tail wheel training when checking out pilots on a tail wheel airplane.
I do not take them flying until they can demonstrate complete control with the tail up on the runway......when there is light wind and traffic permits you can use the runway in both directions to save taxiing back to on the taxiway.