How can I tell if a book is a first edition

[normy]

I have a Hardback copy of the andy warhol diaries by Pat Hackett, which I believe to be a first edition.
There is a sequence of numbers from 10 - 2 on the copyright page.
Does this mean it is first edition, or second?

[sir.prize]

http://www.booksellerworld.com/identify-firste ditions.htm

[mycats]

second edition, the numbers would have to go from 10 - 1