How can I change a PDF document to have an enlarged text area and smaller margins?

Question

I've just been reading a long discussion initiated by a guy who wanted to recompose a PDF file to print in fewer pages. I'm not asking about that. I'm aware that Acrobat Pro 9 will not recompose the pages of a pdf for you; as someone said, it's not a word processing program. I want to copy a PDF to a new file with an enlarged text area and smaller margins, so I can read it more easily. My eyesight isn't so great.
I'm trying to print a decision of the US Supreme Court, for my study. The problem is that these PDF files of such decisions are composed in 10-point type with generous margins, in folio-size pages smaller than 8 1/2 x 11". When you open PDF files of these decisions, you get extremely wide margins and relatively small type. Essentially, I'd like to re-rasterize the document so it prints on my 8 1/2 x 11" paper in a larger apparent type size, but in the same high resolution as the original. By the way, the decision I'm working on is almost 200 pages long, so I don't want to do this, obviously, in a page by page manner.  
I guess I could do this in Photoshop, by blowing pages up and cropping them. Photoshop does a good job of eliminating the jaggies when you do this. But it would seem better to re-rasterize the pages from the PDF source file. So would any reader be kind enough to explain this process to me? (I'm fairly savvy in Photoshop, Illustrator, and computer printer concepts, but a complete newb in Acrobat.)

Answer 1

If you just want this for printing, one thing you can easily do is crop all of the pages to remove the margins. For example, you can rop 2" off the left and right sides, and 1.5" off the top and bottom. Then print using a Page Scaling of "Fit to Printable Area".
To crop in Acrobat 9, select: Document > Crop Pages
be sure to select All for the Page Range.