People often ask if it is possible to learn Tai Chi or Chi Kung through a book or DVD. Well, you could probably learn the moves but it is impossible to feel or understand the moves without proper tuition. I once had someone come along who had learnt the whole Yang Long Form from a Video and to be fair she hadn't done a bad job of it but at the end of the day they were just moves with no substance or intention. This is something that cannot be conveyed to you via a book or DVD. Billy Joel once summed it up in one of his songs saying 'There's a new band in town but you can't get the sound from a story in a magazine'.
You do need someone who understands the principles and concepts of Tai Chi or Chi Kung to make any real progress so don't be afraid to ask for your teachers credentials - who have they trained with? how long have they practised themselves? I have practised both arts for over 25 years with various masters and teachers, all of whom have been absolutely brilliant and if I am honest I would say there are probably other master/teachers out there who can take me even further along the path. That is one of the things I love about Tai Chi and Chi Kung it is a never ending journey - never a dull moment!!!