Just did this myself. Be sure to use a little bit of heat (heat gun works good) and a suitable sized puller. The sprockets tend to stick a little bit, so you have to coax them off with a little bit of shock. As in, mildly rap on the sprockets with a brass hammer or drift while the puller is loaded and pulling on the sprocket. Doing so reduces the amount of the load you have to crank into the puller. You don't want to whack the heck out of it and possibly dislodge the puller while it's loaded. Last thing you need is that puller's stored energy mule kicking you in the face.......
Also, don't hesitate to grind the jaws of your puller to get a good grip on the sprocket. You want to pull on the meat of the sprocket, NOT on the sides of the teeth.