If you've taken privates and doing greens and blues but wish to save cash, as suggested prior, group lessons may be a good way to go. Some resorts let ya pick up a class and lift reduced in price, or multiple days with lifts with greater discounts.
I found that when I learned, the instructor would watch each of use come down or go down a hill and then point out issues and suggest solutions and tricks to correct, or ride next to each of us and encourage the suggestions.
In between his direct time, it gave one time to practice and concentrate on improving. The big thing was finding an instructor who could eye a whole class and manage us all effectively. I got lucky and with the group I was with, talked the instructor into coming back the next day and the one after ... he swapped one class and worked the third which was to be a day off.
Given this was a class with 6 then 5 and 5 students, our price was good and while he got book, perhaps more for being requested, he also picked up more in tips than with complete strangers.
So, if your learning, it may be good to take group lessons where you can practice your skills in between and for the savings, add to the tip making you and the instructor feel better.
If privates are needed, then perhaps after groups. given the pricing it may be worth trying anyhow.
neck wise, the one (and only) time I did ski in my mid twenties, my neck too killed me. I did a lot of pushing with the shoulders on flats ... a lot of it and even some up mild hills as i feared any speed for an up and over. really funny when i think of it, I'm certain i looked like a goon thrusting my head forward while pushing the shoulders back.