Mimi,
I just thought I'd get my $.02 in here.Most of the time the pulley comes off w/o any problem,just be sure to loosen the set screw first.IF it doesn't want to cooperate you can put a larger wrench between the back of the pulley & the motor & pull the clutch arm down & it acts like a puller & after it slide off a little you can lift the arm up & put a screwdriver behind the wrech to fill the gap & pull the arm down again.
This is how we've done it for years if they are tight.
HTH,
Bob