Thanks for all the help; I was feeling totally confused by the whole thing...
What I've done now is I've bot my yarn online from KnitPicks and am now waiting for it's arrival. I will knit a swatch first and see how it is with my tension and see if I need a different size needle to achieve the lovely loose knit that this pattern calls for.
I know I sounded like a bit of a knit-wit but... that seems to be the norm for me these days. Thank you so much for your patience in answering my questions.