prot pally & vengeance dh

[Xiodrade]

On a single computer setup, how hard would it be to multibox a prot pally and a vengeance dh in raid? I am a top player on both ranking in the top 100s across all fights. Just thinking about splitting them between two licenses and playing both. I do have 2 keyboards if need be. I know playing two of the same class is simple enough, but not sure about 2 different ones.