I started a couple seasons ago, but really only committed this past winter. You need to committ, NO switching back and forth, if you do you will always resort back to the Alpine technique.
A great way for a semi-lesson that is free (well just the price of a life ticket) is to get out there with a group of Tele-skiers. Most mountains have a Tele-Tuesday (that is what it is called at Beaver Creek) or something similar. If you have the money take a lesson, but be warn that in a lesson, you still aren't going to learn it all in one lesson, that isn't most instructors teaching styles to cram everything into one lesson (I'm a Alpine instructor).
My friend and I both started together, we got "Allen and Mike's really cool telemark tips". We picked one tip each day and worked only on that tip, it helped us stay focused on one thing rather than trying to learn it all at once.
Main thing is: JUST GET OUT THERE AND DO IT. My friend and I both started at the same time, we are both strong Alpine skiers (I may be a tad stronger), neither of us took any organized lesson, just Tele-Tuesdays. She is much strong than I now because she was able to get out almost everyday, where I live in the front range and have an office job so it was weekends only for me.
Don't be afraid of falling...its going to happen!!!!!! If your not falling, your not learning!!!!!