It's far easier to point you in the right direction than write a new book.

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Basically the answer is "it depends". There are two major varieties of Hydrangeas and they have to be pruned differently.

Read this article, it's pretty good:

http://www.finegardening.com/how-to/articles/how-to-prune-hydrangeas.aspx

Hopefully you can figure out which you have from the descriptions.