Clamp a metal straight edge to the door where you want it to be cut off (trimmed). Use a sharp razor knife to score the veneer on the door. Use slight pressure for the first to strokes of the knife to help prevent the knife from going off course. Then apply more pressure and score as deep as you need to. Use the router to finish the trimming.I want to use my router with a guide rail to trim the bottom of some internal doors. Practicing on an old door, the router bit is not clean cutting through the solid wood bottom rail. It is peeling off timber. Any thoughts on what is going wrong? Any tips on routing this way would be appreciated. Btw i am going anticlockwise on the door.