You would go to Image Size and enter the dimensions you want.. 24x24 and then choose bicubic Smoother and hit ok. The layout will double and you can then crop out a 8x10 and print it.

No.. I'm just saying that typically when you blow up photos or photo quailty layouts, you will get a better appreciation of from further back. That's why 8x10 is such a popular size (but not good for most digital slrs!).. it looks good close up and from a moderate distance.. however, put an 8x10 on a large wall and it gets lost. Put a 16x24 up in its place and you have yourself a very nice looking print.. that's what I meant.

Good luck.. you should be just fine for this size. You might look into getting these printed professionally.. the prices aren't much more than getting them done locally and the quality is amazingly better.

I use www.whcc.com exclusively for my professional photo printing.

Good Luck!