Hi,
This bit of advice may not apply to everyone, but I try to purchase boarding and cabin shoes that are about half a size bigger than I require. As your feet have the tendancy to swell when flying, the extra space in your shoes allows for extra comfort. You can always compensatre for this extra space with heel grips or in-soles if required. Clarks are pretty good as they usually supply shoes in half-sizes.
Glad to hear you're so excited about embarking on your aviation career. FCA are a lovely, "colourful" airline (you'll get used to the pink). I do agree with "Wan2fly" tho, make the most of your six months and the opportunities it will offer you as there are many people out there who would love to have the chance to make a career as Cabin Crew. It is a very rewarding job so above all - ENJOY IT!
Good luck with the training and see you on line in about 6 weeks!
Happy flying,