Mental practice... Imagine, visualize & feel the movements.
Focus on stance & balance.
Dynamics... Be precise, dynamic & accurate in all of your daily activities. From walking on the stairs to driving the car, make it all about skiing.
& as has been said, read about it. Watch lots of ski porn, ski races, & instructional stuff. I often tell my students "1st you have to read about it, 2nd you need to see it, 3rd you get to try it & lastly you will feel it. Once you "feel it", you will then begin to understand it.
Technique wise, I often think my first turns of the season are usually some of my best! I tend to stay on easy groomers (usually that is all that is open, so it is pretty easy to stay disciplined) & focus on the absolute basics, with an emphasis on whatever I was trying to refine during the previous season.
If the first day is a powder day, that all goes out the window of course!