I imagine a rotozip handles like a router (it basically an HO guage router anyway) I do know you need to cut into the direction of the cutter so it is fighting your advance, not "helping" you. Otherwise it will get away from you. You also want the cutter holding you against a guide if you are using one. I may not be explaining it right but I do have some arrows scratched into the case of my router to remind me which way to set up the piece.
