Hi Dan, the bolt on the pulley is only torqued to 40Nm plus 90deg so it should'nt be that difficult to remove, when you have the crank in the correct position No1 on TDC and the cams locked remove the starter motor and jam a large screwdriver into the ring gear to lock the crank and the bolt should undo without too much difficulty, remember you must use a new bolt when re-assembling
nigel, April 2008