spark plugs on 2003 Chevrolet Venture

how difficult is it to chane front & rear plugs.

front is easy, rears are a pain in the butt. i remove coil packs and module to gain acess to the plugs and wires.
thank you, can this procedure be done from under the van as well or does it have to be done going over the engine.
With right tools , probably easier from up top.
1 more answer
it is very difficult!! My fiance had to take loose the motor mounts on the front of motor and rotate motor forward. then he had to take off coil pack to reach back behind/underneath to get to rear plugs, very much a pain!!