Conjurer/WHM is the first healer the game initially expected us to play before sub-classes were dropped. The WHM moveset is thus more straightforward and streamlined, you heal hard and you hit hard. While WHM absolutely has mechanics to it with the Secret if the Lily buffs, it's not as deeply entrenched into it on the level the cards are to AST or Faerie management is to SCH.

CNJ eases you into the key mechanics of the role and how it's built in FFXIV. You will be expected to pepper in damage dealing spells between heals, but you'll also land in situations often where you just can't take a second to cast a Stone spell over a Cure. Sometimes it's during massive dungeon pulls, others it's just a tank-bustering moment in a boss fight.

Healing requires you to be adaptable, and that comes from practice. Go forth and PUG, young one.