Remember, for an 8x10 print, you will be getting a print that isn't be the same aspect ratio as the original file. Plus, labs always upsize the image so it will "bleed" (a printing term here) all the way to the edges of the paper. Here's how a photo of my photographer friend and aunt will be cropped for an 8x10 print:
Cropped Image for 8x10 print:
Loses some of the camera at the bottom and the hat on top.
Aspect ratio is another problem with prints, but as long as you are aware of the limitations of your intended prints, you can shoot photos that have a little leeway for cropping.