Do I have to fire my agency attorney to hire Attig | Curran | Steel for representation at the Veterans Court?

No.

While the VA only allows a veteran to designate one attorney at a time, representation at the Court of Appeals for Veterans Claims and the U.S. Federal Circuit Court of Appeals do not require us to enter an appearance as your client’s attorney before the VA.

As such, your agency attorney's VA Form 21-22 or 21-22a remains “live” throughout the course of your appeal to the CAVC.