Fairies are bad on auto because they blow cooldowns as soon as possible every time.

Selene used to be amazing on auto in 2.0 because she would cycle buffs, but since she got the esuna she went full stupid and now tries to esuna REZ SICKNESS of all things. XD

Just practice and it will be no trouble. Using pet abilities are really no different than just using your own abilities if you do it right (aside from being able to cast them while you're casting something else).