If you practice your rotation on your job on a dummy to commit that to muscle memory it will be definitely easier since you can look at the boss and their cast timers while reflexively playing. Jobs that don't require procs as much would be the go-to - except those jobs generally have a lot more button pressing to do. Jobs that don't spam buttons generally require more skill and finesse - such as BLM or WHM - because majority of BLM is dependent on optimizing how you tackle the incoming damage by positioning yourself or moving to someone else to continue attacking more. Black Mage still has procs but in the later stages you don't rely on thundercloud procs as much, mostly for movement or refreshing the damage buff since it does less damage than Fire IV.

WHM as a healer has a very simple pattern for damage - Glare and Dia until the enemy dies. With less mobility tools at their disposal, they have to make all their weaves count. However, they spend most of their energy on the boss and reacting to damage instead when first learning the fight. Depending on how much reactive play you want, healers may not be the go-to.