Another suggestion for practicing that you might enjoy is to follow along with a yoga DVD. The benefits from a good yoga DVD is that you'll be given instructions for doing the poses, sometimes with suggestions for modifications and the use of props.
There aren't many Iyengar Yoga DVDs unfortunately, but you might enjoy trying out DVDs that present different styles of yoga.
Check out your local library for yoga DVDs. My local library, the Ann Arbor District Library has a number of yoga DVDs to choose from.
Here is a sampling of DVDs to take a look at (the "More info" takes you to each DVD's Amazon page):
The first one, Yoga for Beginners with Patricia Walden is a nice, slow-paced beginning level Iyengar Yoga DVD.
Yoga for Inflexible People includes poses taught in the Iyengar Yoga style with suggestions for props for modifications for stiff people. It also includes some flow yoga routines.
The Rodney Yee Power Yoga DVD is for those of you who really want a "work-out". Rodney Yee isn't an Iyengar Yoga teacher, although he started as one.
The last DVD, Yoga for the Rest of Us, is one of a series of Gentle Yoga DVD's by Peggy Cappy.