Hi Angela,
You probably already figured something else out by now, but I would add in a bleed in photoshop (enlarge your canvas by 1/4" all around and extend the background of your design). You can also pop some trim marks in the corners at that point too (I save a file called "trims" with a layer for every size trim mark I need). Little cross hatch marks can work. Once you have that on the full bleed PSD file, save it as JPEG or PDF and then bring it into an 8.5x11" PDF. Copy it, set it up so they don't overlap and don't go into the no-print margins (0.25" from the edge for most printers) and you've made yourself a 2-up setup with full bleed and trims.
Bit of a pain to do all the time but if you only have the occasional client requesting this, it's doable.
Hope that helps!