Here's some tips for easier door hanging. For this type of door, measure five inches from the top of the door to the first hinge, ten inches from the bottom for the second, and place the third hinge centered between the two. Plough out the mortises with a wood chisel or a router. Align your jamb to the door edge, leaving a three-sixteenths-inch clearance at the top for the swing. Plumb and level the jamb and use a longer screw in each of the hinges to reach the jack stud.
For more on doors, consider:
Quick Tip: Hanging Double Doors
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Know Your Door Styles: 10 Popular Designs