hey yoga! I started this year too!
Downward dog also gave me problems. There is a short yoga series called sun salutations or Surya Namaskar. There are three basic sequences (A, B, and C) and a lot of instructors modify it a bit. I started doing a sun salutaion or two every morning and every evening. After a week or two I could stay up with the class.
type B
arms over head
forward fold
right foot back
plank
cobra
downward dog
left foot back
half way up
forward fold
arms over head
I still have trouble with some of the balance poses and some of the positions I will never be able to get into. But hey, If I could do it all I wouldn't need it?!
Good luck with the yoga, I'm really enjoying it.
jacy