Welcome to the Forum from Western New York State!
Changing the lights to LED is very easy. The clearance lights can either be swapped out for new ones, or easier yet, change out the bulbs in your existing lights for LEDs.
The tail lights have an LED upgrade kit available from Command Electronics. I installed those in our tail lights a few years ago, and that was a simple job. It only took a few minutes to complete. Here's the tail light kit.
K-0026: SURFACE MOUNT LED TAIL LIGHT UPGRADE KITS — Command Electronics