Suspect the job will be easier then you think. Drive out the coupler pin and remove the coupler. I imagine the shaft slides out giving you access the internal seal. The coupler is ust a round piece of metal with a slot in it that engages the end of the cam.
Be sure to keep track of and/or mark every thing as you take it apart and put it back in the same location. If you access to a digital camera you can take a few photos for refeance as you go along. I would bring the engine to TDC on Cylinder No 1 just to have a reference point for distributor removal/installation.
The sensor pickups may or may not need to be removed. This being I assume a 5-SFE and the same as the Camry, some details on the distributor are available at the link below.
http://oregonstate.edu/~tongt/camry