I started out with the modified Sun style for arthritus under one of Dr. Paul Lams deciples, and have since gone on to study the standard form on my own.
Hi Don,
Did you study the standard form thru DVD or book references?
Perhaps the message that Pete is trying to convey is that if you studied the modified form under a live instructor, you might make the best ongoing progress in your training by continuing to study that form, with that instructor.
If the instructor is no longer available to you, then perhaps the better idea is to focus your solo practice on that which you learned from him, rather than trying to learn something additional thru DVD or book medium, including taiji sword.
Most serious students of the martial arts, including taiji, feel that it is really impossible to properly learn any martial art thru DVD or books, if that is the only method you are using. DVDs and books can be a useful reference tool if you are also training directly with a good instructor. But all by themselves, you just cannot properly learn the methods with the level of understanding and precision that is needed. At best, you will accomplish a hollow mimickry that just lacks any substance. Martial arts aren't simply about swinging your arms "like this" and stepping "over here". There is a lot more going on while you are swinging your arms and making your steps, and that cannot be adequately taught without a live teacher to work with.
So I think what Pete is getting at is, if you do not have access to a good taiji teacher, then your time and effort and money would be better put to use in searching out a good instructor in ANY other style, with whom you can train directly. You will simply get more out of the experience than you will thru even the best of self-directed DVD or book courses.
It is my opinion, and I know that it is shared by many here and probably Pete as well, that those who produce instructional DVDs and books, with the aim at selling them to the general public at large, are doing a big disservice to their customers. They are misleading them into believing that this is an acceptable and good way to learn the art, and it just simply is not. If they limited the distribution of their DVDs to their own students who are studying with them, to use as a reference tool to augment their training, then I (and probably others) would not have a problem with it. But the fact that they are selling these to anybody willing to fork over some bucks for it, is a real disservice and they are doing nothing but enriching themselves thru the ignorance of the general public.
Anyway, hope this helps, and good luck with your training.