I am no pro, but I got two cents to add
What I have found out and still try to apply even though my mind is telling me its confused is to follow the pattern as it says and to keep going, it usually comes out and makes sense in the end. While that is a no duh comment, I know from experience, that I go into auto mode and I won't realize it until I'm lost.
This pattern specifically, I am not sure what you mean on what to do. Do you know how to decrease?
If that is the problem, to dec you insert the hook into the first stitch, yarn over and insert into the next stitch and yarn over. You should have 3 on your hook, then yarn over and pull through them all, then you continue the sc around.
I hope that helps some and if not I hope i didn't confuse you more.
If you need pm me. Good luck, stick with it and finish it, if it doesn't come out right the first time think of it as good practice