It's not very difficult. Just cycle through the party by hitting up and down on the dpad. Or use macros, but I don't know anything about macros to help with that.

And from I hear whm is a reactive healer which I kinda agree with since that's what I am and it does seem that way. And sch is a proactive healer in that they try to prevent damage. I'm not sure if that is true cuz I haven't played it. But I will say that I personally don't like the pet control or the pet hot bar on the ps3. Also I'm not sure how good the fairies ai is. If its anything like my chocobo it's not good lol.