Hanging a door is a relatively easy project that is more about patience and precision than about mastery carpentry work. If you can drive a screw and use a wood chisel, you can probably hang a door.
Doors come either in pre-hung or slab form. Pre-hung doors are for new-construction or major remodel work where walls are being opened up. Pre-hung doors are shipped with their hinges already attached to a frame.
A slab door is a door only—no frame—that comes often with a pre-drilled hole for the doorknob but no insets cut into the side of the door for the hinges. These insets are called mortises, and they are necessary for the door to fully shut.