These are the two most important things I have take away from getting back into skiing after a decade hiatus.
1) Demo'ing skis allowed me to avoid buying a ski that would have been a mistake and allowed me to find the skis I never knew existed.
2) Ski instruction, while I can comfortable ski the whole mountain, I wanted to make sure I was skiing the right way. I ended up getting a ski instructor who really helped me improve my form and technique. I was able to ski 50% more runs in duration than I have previously done and I can ski at higher speeds more comfortable. As I my form looks/feels more like a racer than riding in the seat, my quads don't burn anymore. It feels like it is a good idea to take a couple lessons throughout the season so it allows you to work on what the instructor has taught you.