The impression should
not require huge amount of pressure - and only one pass through
the press - its easy to pour on the pressure and run through the
press several times. If the pressure is right, the plate should
separate from the paper easily and leave a good impression -
if the paper
is sticking to the plate the pressure is too much - however you
can release the plate by soaking it in warm water.
find the plate has absorbed some water and become a little sticky
- also make sure you dry the plate and harden it again in the
sun before you try the next print.