Cut a 45-degree angle on one end of the trim and hold it so the short end of ... or less, and is close to the window jamb, just chamfer the edge with a utility knife. Check to see if you've ...

Then, make standard 45-degree miter cuts. Cut a shim just thick enough to slip under a straightedge spanning the drywall corner. Use this shim to elevate the outside edge of your trim molding ...