Not so much operative because you excavate decay. So no worrying about if your isthmus is too wide or you nicked the transverse ridge. In the real world there are lots of products to make your life easier.
Work hard on your crown preps because they can be tough at first. Things like undercuts, lack of occlusal clearance, unclear margins, etc are a problem in the real world. A nice crown prep will make delivery so much easier.
Oh and when it comes to crown peeps, it’s important to know when to stop. Constantly making taper adjustments or margin refinements, whatever, you will end up with an overprepared tooth that may no longer be restorable.