I play a priest and lock. My priest is the main. My macros are set up like this:

/assist Xsun
/stopcasting
/cast <something>

Which is a problem. Cause whenever I try to heal myself I have to switch back targets in order to keep my lock casting stuff. In the end theres just a whole lot of target switching and its really inaffective.

Like this I doubt I will be able to run any instances with both of them =/.

Anyone played this combinations and would like to share their tactics? Any advice at all as to how I should set this up would be greatly appriciated cause I cant get a hang of it.