I can't imagine trying to cut and paste multiple maps together.
If you want a large map of an area that you'll be visiting over and over, buy a large commercial map. It's hard to tear, hard to smear, and comes in a size that's uneconomical for single-serving prints. I own more of these than I care to count.
For an individual trip, I print out a small-scale map of the area I'll be visiting and plan on throwing it away when done. 8.5x11 is typically fine for this, at the worst I'll make two prints that cover different sections of a trail, or a zoomed-out print of the approach and a zoomed-in print of a climbing route.