If you have the three holes you are ok and best to use pulleer described above.
If no holes, try a bit of heat, but you will of course have to be very careful if it is a rubber bonded outer bit!!.
When(eventually), you do get it off, if you apply valve lapping paste between the pulley and crank nose where it sits, and gently grind it it will come off a lot easier in future, I was lucky, but know some can be seriously tight, best of luck to you!!
tabetha