fork seals isnt a very hard job on regular forks... bugger upside down forks tho

and i doubt ZZR1100 forks would be anything but regulars
helps to have a service manual... but really its not that hard... ya just gotta:
jack the front end up
take off the calipers
take out the front axle and take the wheel off
take off the front mudguard
loosen the fork caps (but dont take em off)
undo the bolts on the triple clamps holding the forks in & remove forks
take the caps off the forks now and remove the springs... drain the oil out and leave them to drip for a while, pumping the legs to help get the oil out of the damper... perhaps even give them a flush with kerosine or something. pop the dust covers off, slide them off.. then you should see a clip above the fork seal, take that out. now give the fork legs a bit of a pump till the seals pop out. throw the old ones away, then slide the new fork seals on... a piece of 50mm PVC drain pipe is handy at this point, slide it over the fork and hit it with a rubber mallet to drive the fork seal down into position...
now put everything back together in reverse order, stopping to put new fork oil in just before you put the fork caps back on... you'll have to look up the required level or how many ml's to put in... and what grade of oil etc
well thats how its been for all the bikes ive had to do it on (cbr250, zx9r) so cant immagine the ZZR would be any different... good luck!