I was really confused by the first part of your statement at first! But I come from always working in pediatric hospitals, where I see central lines, chest tubes, JP drains, foleys, epidurals, etc. etc. on a daily basis and especially in pediatric oncology.
OP brush up on your Childhood Development Stages/Ericson+Piaget - you don't need to memorize them like you are studying for an exam, but in pediatrics you do need to understand the basic concepts of them so you can appropriately interact with your patient depending on their age and development.
And yes, the biggest struggle without question is dealing with the parents. Try to always keep their perspective in mind, no matter how trying they may be...and they will be trying.