Georgina,
Go for it,I have known several cabin crew progress from "back To front". Some took the job whilst waiting for a course,and others paid for their own flying.The ones that funded themselves tended to build their hours up in the States(It's less expensive there).Thus a cabin Crew job helped in this respect.(id 90's and such with a scheduled carrier).....If only I'd worked harder at school,I'd like to be making a decision similar to yours!!