What to Expect from My First Bespoke Experience

Hi, I'm 18 and will be going in to New York next weekend to meet with Sean O'Flynn of New and Lingwood for my first bespoke fitting. I was wondering if you could tell me what to expect and/or if there's anything that I need to have with me when I go.

I am very excited about the prospect. I am lucky enough to have been brought up by a very well dressed father who has passed his taste down to me. Before now I have been wearing shirts from Thomas Pink and while they've been bashed a couple of times on this site I think that they certainly did/do the job for someone my age. But, after giving it some thought and going through potential shirtmakers I have decided to make the step up to bespoke shirts. Thank you in advance for your help