Crank Angle Sensor HELP??!!!

[shorty85]

Ok so the Vs has been running a little rough for a few weeks and after changing the O2 sensors drives better but is still running a little rough and spluttery wen putting the foot down.......so thinking its the crank angle sensor this time only problem is cant seem to be able to get the crank pulley off to get to the sensor can someone plz help as to how i can get to it as it really needs to be changed and its also taken to not starting straight away after being driven so is proving useless for running errands......getting nothing wen the key is turned but reds come on and then it will eventually start after 5mins of trying. Any feedback would be grately appreciated

[accentstencil]

You will need a gear puller to get the harmonic balancer off. No way of getting it off without one.