The Shoe Is On The Other Foot Meaning

(idiomatic) The roles of people in a situation have been reversed, such that the advantage has shifted to a party which was previously disadvantaged.

Example: 1919, Ring Lardner, The Real Dope, ch. 1:
  Some of the birds on this ship took me for a sucker and tried to make a rummy out of me but I was wise to their game and I guess the shoe is on the other foot this time.