For the first four dungeons I honestly barely have to heal at all, maybe look at HP just to make sure, esp during boss fights and with new tanks, but most of that time I just sit in CS and let Eos do whatever. Every once in a while I see that Eos has stolen aggro, but usually the mob dies in time for her to not die.

If you really wanna heal as SCH in lower level, just don't bring out your fairy (but why....)