First, here is my finished piece. The hat was another project I completed recently and I wanted to share that too :-) Please forgive the poor picture quality and reflection of my glasses.
I absolutely love how this cowl turned out! It is extremely warm and I have even thought about adding a flower to it to jazz it up a bit. What do you think?
Okay, now to answer a few questions:
Why are there so many different stitches?
There is really no reason to switch between the different stitches. It is more than likely to switch the look of the cowl up a bit. You could very well continue this piece in all single crochets, or all half double crochets, or double crochets.
Please help me with the slip stitch at the end of each round:
The slip stitch at the end of the round is how you complete each row. If you remember at the beginning of each row you start by chaining. When ending the row you make a slip stitch into the top of this chain (really into any hole at the top). You slip stitch by placing your hook into a space at the top of the chain, yarn over, and pull through all loops on the hook. I hope that helps.
Could you please measure you finished piece:
At completion my cowl measured 14" long and about 14" wide.
As I said, please leave comments with any of your other questions. Sorry this took so long for me to get to, but hopefully I can help now! :-)