Well, for starters this pattern uses British crochet terms, which are different from American crochet terms.
You can find the conversion chart here: http://www.garnstudio.com/lang/en/in...ochetterms.php
HOWEVER (you're probably not going to want to hear this) I would highly
recommend doing several patterns written in American crochet terms first; otherwise, you may royally confuse yourself and get the stitches mixed up for ever after!!
Converting this pattern would be somewhat challenging for me, and I've been crocheting for many, many years.
Have you looked for a similar pattern that's completely written out using American terminology? I'd be willing to bet that there are lots of them!