I've snowboarded for 12 days in all (ever since end of last season), and began practicing progressively more switch over the last 5 days riding (last two weekends). Today, I finally managed to go down a blue run entirely switch with solid technique and no falls. It was such a euphoric rush getting to the bottom doing that; it's the joy of learning the fundamentals all over again. ^_^
For me, it's been most challenging to re-adapt to the feel of making those small, surfy, sliding turns, rocking edge to edge, in flatter, narrow routes. They were the last puzzle piece to fall in place in regular stance, and it's much the same for goofy (switch to me). But it's coming along! I think it's tempting, for people who are anxious to learn fast, to want to know some secret approach which gives them an edge in accelerating the process, but I really don't think there is one for switch riding. If you're proficient in your natural stance, it's just a matter of consciously applying all the body mechanics you've already learned onto your mirror image. Expect to fall on your butt and face a lot once again (I certainly have often). It just means you're challenging yourself to improve, which is a wonderful thing.
I was surprised to read so many other posts in this thread about riders learning switch with asymmetric stance set-up and/or board shape. I bought my new, second board with the requirement that it was a forgiving (somewhat soft) true twin, with the intent that I would dedicate myself to learning switch with a perfectly symmetric stance set on a perfectly symmetric board. I want to do everything I can to make my switch riding just as natural-feeling and identical in form as my normal riding, so I use a totally centered stance with +15/-15 duck angles. I personally wouldn't want to attempt it with any asymmetry. And I can't see myself ever buying a non-twin board again with how important switch is to me. However, I commend those who can ride switch on directional boards with different angles. It must be a bit harder that way.