Yes, it is a start. And this way you will be familiar with the poses when you do go into a classroom setting. Another helpful tip is to use the wall to support you, and buy a block (you can get them from any yoga supply place on line or even at target). When doing standing poses like trinkonasana (triangle) when you have to put a hand to the floor, put your hand on the block - starting with the highest point of the block - so that you can work your legs and lengthen your spine. It's easy to focus on getting your hand to the floor rather than the integrity of the pose. I also like to use a mirror when I am alone. Oh, and don't forget the breath. It's key to yoga!

I just think it's great you are making the effort to try something like yoga on your own, without the push of a teacher or others around you. It's always harder than it looks.

namaste.