Question about solo healing

[SpartanEQ]

I started my first caster and I plan to group as much as possible, but when I'm soloing, what's the best way to heal myself while fighting? Are there a series of commands that will target me, heal me, then re-target the mob that I can make into a button? Trying to click the mob or hit a function key can be a pain.

/target Hefty
/cast 2
/cast 2 (just in case I fizzle?)
/now-what-do-I-do-to-re-target-mob??

Thanks.