Just checked the pattern, it is cute! Here
is a link that shows the 2 ways of doing a crochet provisional
cast on. It is down the page a bit under the title
"Invisible Crochet Cast On".
As the pattern is having you do a provisional cast on that
will be removed later, you could do any type of provisional
cast on if the crocheted one is confusing. There is a video
on this site herethat shows a different method and I am
sure if you did a google search for provisional cast on you
would come up with a lot of info!