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The easiest way to replace the hinges on an existing door is to leave the door hung on the jamb (frame).
Start at the top and remove the first hinge on both the door and the door jamb. Install the new door hinge in it's place. Do the same on the middle hinge and the bottom hinge.
If you remove the entire door from the frame by removing all of the door hinges at once, it will be much more difficult to mount the door and harder to get all the hinges to align and work properly.
If you are replacing all of the door hinges in your house, consider using a cordless drill with a screwdriver tip.
Replacing hinges is not hard to do at all - just a little time consuming. However, the end result is a much better looking home when the door hinges match the door hardware.