I always recommend a qualified instructor. And personally, I find it a bad idea to use a friend. My friends were climbing, and one didn't really look out for the other because he had no clue what he was doing, and the other one got hurt. It wasn't serious (the injury) but the friendship is very damaged.
Wow that isn't any fun. Why is the friendship damaged, I'm sure that it was a big accident. I'm sure it wasn't on purpose or anything like that was it?
Sometimes people don't take it that way. When thinsg like that happen, their expectations from the other person is so much higher that when something bad happens. it kills the relationship.
go to ski school, skiing is all about good technique, and if you are 'self-taught' or worse taught by friends, you will end up with bad technique and not become as good as skier as you could've.
I would just go to a lodge and take one of those 1 day crash course that way you can learn the basics and then hang out with your buds and get them to help you out as your practice
Lessons are key, the quality of the school is most important of all. Don't waste your time on group lessons
b/c unless you are the best or worst in the group you won't get much out of it. Take a lesson then practice what you've learned until you get it down then take another lesson and so on. It's also good to ski with people who are better than you currently are, just follow and learn. I've been sking for 50 years and every now and then I have another breakthrough day! It's a constant life long progression and remember "if it were easy, they'd call it snowboarding."
Taking a lesson or two is the best way to get started. I am an instructor on the snowboarding side and am going to learn to ski as well. One thing that is true regardless of which sport you try is that it is very easy to develop really bad habits early on that are hard to break when you learn on your own or from friends. A good solid foundation from learning the basics the right way will make your progression more solid and expedient.
My advice is to take your first lesson as a group lesson. This saves you money at a point when you won`t benefit as much from a private lesson. After that first group lesson or two, go practice...A LOT! What will happen is you will soon discover your problem areas; things that are difficult for you to master. At that point, a private lesson is extremely helpful because you can target specific tasks and the instructor can give you his or her full attention.