Here are two different links to help with learning how to express anal glands...
\My tips:
1. Practice makes Perfect
2. Tail HAS to be at a 90 degree angle (straight up) to feel the glands properly
3. Do it in the tub.... if you can use gloves and forget the tissue... it's easier to feel them ...
The first is a video: http://www.expertvillage.com/video/8...ics-glands.htm
The second is an article with digrams: http://www.dr-dan.com/analsac.htm