I've been doing peds for all of my career over 13 years, and I absolutely love it.
The worst part about peds is actually dealing with difficult parents. But at the same time 9.9 times out of 10, the parents knows their child the best so listen to them.
If your facility has ancillary support, such as Child Life, use them as much as you can especially for procedures, IV placement, scans, etc.
Never forget your stages of development from nursing school so that you can approach each age group in different ways that are appropriate and make simple things like giving oral medications smoother.
Speaking of giving oral medications...when all else fails, push the liquid med in their mouth, pinch their nose, and blow into their mouth - sounds (and looks) absolutely torturous, but sometimes it is the only way to get them that very necessary med.
Lastly, remember that kids of almost all ages are extremely smart and in tune with their bodies. They may not understand exactly what is going on, but they know something is off and different. Respect that they know their bodies, no matter their age.