HP Deskjet printer buying guide

I need two sets of passport photos(not to used for a passport, but to submit to the USCIS for an I-103 application for my wife) and I would like to create my own, rather than paying Walgreen’s or CVS their ridiculous fee. I understand the specs ie: 2×2, plain white background, etc, but does anyone know the basics in how to do this. Obviously, if one knows what they are doing, it’s got to be a breeze. I have a digital camera, HP Windows XP and a HP Photosmart 2575xi printer. At least if you could tell me how to edit them for later printing. The set up and all. Thank You so much