If it does not fill up the entire page after inserting, yes you will need to re size.
Before you insert set the page orientation to portrait or landscape according to the directions printed on each design. Set the margins to .25 all sides. Insert the picture then drag the corners to fill the page. It might take some trial and error but I really have no control over that as every printer and program is different. I would suggest if you print test pages to do so in black and white so you don't use up your color ink. On my computer Windows photo viewer works well for printing with no re-sizing, just be sure to un-check the fit to frame box if using Windows Photo viewer.
Awesome! Thank you.