Please forgive my lack of knowledge, I've noticed Birkins all my life but only in the last few months, thanks in large part to reading so much about your fabulous bags, have I decided I want to own one of these works of art. So I'm collecting info about color size material, etc. but when I figure out what I want, how does the list work? Do I just go into my local store (NYC) and give them my specs? Will they take me seriously? Do I pay for it now? I'd actually LIKE to be on a list for a few years so I can save up the $--I really appreciate any advice!