How do I read a PDF file in my eBook?

Hi experts!
I have a new Nook, and I have a document here in PDF format that is really difficult to read. It is so large and the margin is very big. It is not really that readable of a material anymore.
I got this Nook for me to enjoy reading more and with comfort and I do not see any article in the manual about converting a PDF file.
Is there a way for this to be converted to something easier to read? Is there a software needed to be added or installed?
