Some PDF files have specific features for form-filling. These areas can be edited. Apart from that, PDF is not intended to be an editable format.
Shuffling the pages of a PDF can be achieved by a number of programs and libraries. Editing the text within a PDF is also relatively easy, but bear in mind that it is near-impossible to re-flow the text within the document; if your new text doesn't fit nicely into the space occupied by the old text, there's nothing you can do.
Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.