Jane,
before you do anything about swapping the door around, think about the light switch and whether you also want to move this as it may be behind the door once you've moved it.
Sometimes a (straightforward job) has other implications!
If you are hanging the door on the same side of the door jamb (the wood that the door closes against) you will have to reverse the door (inside facing out) otherwise you will have to fill the hole in the door where the door catch/lock was situated.
This means the catch will have to be reversed (or replaced depending on type).
Then mount the hinges on the other side. 'Letting in' the hinges using a sharp chisel.
Then offer the door up to the frame, using a door stop to bring the door up to the correct height (for clearance) and mark the position of the hinges against the frame. Then let in the hinges to the door frame
Once let in, prop up the door using the door stop and drill one pilot hole in each hinge and put in one screw (use a pozidrive screw initially - much easier and quicker)
If the door opens/closes satisfactorily, then pilot drill the rest of the holes and put in the rest of the screws, then replace the pozi screws with slotted (if thats what you are using)
Good luck
