I would scan the photos and size them to the desired size before printing. I use WordPerfect to re-size photos (it also allows me to "mirror-image" photos, if I'm using iron-on transfer paper)...but there are other programs for re-sizing (such as Irfanview, which is free and easy to use). Also, with WordPerfect, I can put four 4" photos on one page, and arrange them to allow for seam allowances.
If you do not have WordPerfect, there are some free word processing programs (such as OpenOffice) that may have the same capabilities.
If I can be of help, just let me know.