Mixing prints shouldn't take forever. Here's some quick steps to mixing prints:

1) One print should be bold and the other should be subtle. This creates a cohesive outfit. For this outfit, the plaid shirt is the subtle print.

2) Combine prints that are in the some color family or combined them with colors that usually pair well. I wore my leopard boots because red and brown always go great together

3) Always add a piece that ties in the prints. For this look, The black slacks break up the two prints and ties them in.

Old Navy Top, The Limited Pants, Zara Boots, Accessorize Necklace