Be honest with yourself.
You just do an exercise, nothing else. For beginners, you have plenty to concentrate on in terms of your movements, so don't get carried away with cosmic ideas. Don't worry, there are plenty of those in T'ai Chi, but you won't be introduced to them until you get through the beginners programme.

This book is the first part
of DaYan Gong and can
be bought from WahLee
DaYan QiGong is used in this method primarily as a warm-up exercise. It has lots of other benefits and uses that require long and deep study if you've got lots of time, but at WahLee T'ai Chi that's not the focus. Basic traditional Chinese medicine ideas (namely, meridians and accupoints) wil be introduced in this part of the programme.
While T'ai Chi was once a martial art used to defend oneself from the invading Mongol Hordes, today if you want to defend yourself get a gun. T'ai Chi, though its roots are in martial arts (and the martial arts component still exists but most beginners don't look at that aspect), it should be approached simply as an alternative to existing exercise options.