If you are going to work in rounds, the only thing you would have to learn is how to carry the yarn. If, however, you are going to create flat pieces, not only do you have to learn how to carry the yarn, you have to learn to single crochet (sc) backwards! Or you could learn how to sc with your opposite hand (I tried to attempt it, but it was way too hard for me to get my left hand to do what my right hand has been doing for years!)
Also, depending on how you sc, you may have to train yourself to loop the yarn in a different way. Now it is not really necessary, but it affects the slanting of the deign. I tried to teach my mom. Though she could do it, it was just too time-consuming for her liking.
Anyways, back to this project. This is my first attempt at Tapestry Crochet. I carried 1 yarn, which means I was working with 2 yarn colours at the same time. It took a little practice, but I was able to catch on really quickly. For the main portion of the bag I working in rounds, and the strap was worked as a flat piece. I only just recently took pictures of this bag completed, but luckily, I had snapped a quick shot of the bag as I was working on it. Yeah!
I have since changed the way I make the shoulder bags because I found with this one that working in rounds makes the bag stretch down too much, and working the strap by the full length causes the strap to curl. Check out my other post on Tapestry Crochet Shoulder Bags, or check out the Tapestry Crochet Top I made for my brother to see how I have perfected this technique.