It is NOT a big deal on 90-97 engines, 98 & up YES... on the CAM seals (for old pros only). not the crank seal.
with the belt off, the two cam pulleys have to be removed (one bolt each) and you will need a puller to remove the crank pulley, then the seals are in plain site.. So, less than an hour to do it.. And there is no risk for us, we dont turn the cams more then a quarter turn and then just move them back to position (look at the driver side cam, it moved from 11 o'clock down to about 8 o'clock - just barely see the white alignment mark showing) and the second pic shows it turned back to position: good luck..