I tried posting this huge long post, but don't know if it went through!
Anyway, I think most people can learn OS, but like anything, it takes time and practice. It is easier with someone to teach you and show you the strokes, put their hand over yours and let you feel how much pressure each part of the stroke takes, etc.
The Stroking Edge online magazine can be found at
http://www.thestrokingedge.com . I can't give you an opinion as I have never subscribed myself. I have heard of others that liked it though.
I taught myself using books and videos, so it can be done. A good first video is the Brush Stroke Basics Video and maybe even then the One Stroke Technique Guide video. I also have a One Stroke video library (5 videos in a slipcase) that is good to teach you a lot more. The videos are the next best thing to a live teacher, as they show you a lot of things, and then you can go to the books and try on your own once you learn some of the basic strokes and techniques.
Some of the keys to success are to use Folk Art brand paint (thicker and works better with the blending techniques); use a damp, but not wet brush; get an even blend of the 2 colors on the brush before painting; clean brushes well after each session; practice, practice, practice!!
Where in upstate NY are you? I am in the Binghamton, NY area. I have helped a couple of friends start painting OS, and it does help if you have a live person with some OS experience to get you started.
Feel free to ask if you have any more questions. I can't promise my replies will be too quick as I am stay at home mom to our 4 children, 7 1/2 yrs. down to 2 years, homeschool the 2 eldest, and am 5 months along with twins!