Hi,
I've bought this book:
http://www.amazon.com/Tai-Chi-Classics-Shambhala/dp/1570627495
at a local bookstore. In it it states that some of the practices should be guided by a professional teacher. I've started them on my own, and kinda feel different.
One practice involves circulating one's chi through the spinal column and rotating it around the lower tan'tien.
Another practice involves creating jing through pulsating breathes through one's bone marrow.
Luckily the Author is about an hour from where I live, and while, I have yet to make the drive, I wonder if I am 'ok' on my own?