Cutting a tenon joint involves several steps to achieve accurate and precise results. First, mark out the dimensions of the tenon on your workpiece using layout tools such as a marking gauge or combination square. Next, secure your workpiece firmly in place, either in a vise or clamped onto your workbench surface. Use a backsaw or tenon saw to make several vertical cuts within the marked lines on all sides of the wood, creating guide slots for further cutting. Then, use chisels and/or a coping saw to carefully remove excess material between these guide slots until you have achieved your desired tenon shape and size. Regularly check your progress against the mortise or mating piece for an accurate fit.