I think this question can best be answered by some quotes from Master Lin's book:

"SFQ reveals the truth - there is no right or wrong in Qigong movements, only good, better and best." - Born a Healer, Page 139

"Many Qigong masters and teachers tell their students that they have to follow their instruction exactly. If not, it could cause harm in the body. So in order to learn Qigong well, you have to go to a master to learn it directly from him. Many students in my classes have asked me about this. I always smile and tell them this is not so.

You do not need "perfect" technique to benefit from Qigong. If you are practicing Qigong to help yourself there is no right or wrong only good, better and best"
- Born a Healer, Page 140

I hope this helps answer your question!

Thanks,
- Dan