89 300CE 170K

I think the new ticking is a pulley bearing. Jury-rigged stethoscope seems to eliminate under-the-valve-cover source. Ticking goes away when I rev motor (maybe just can't hear it?). I plan to take serp belt off and see if pullies turn freely. I'm fairly handy and have some tools.

So the question is; Do I need special tools to press in new pulley bearings? I can see it's simple enough to replace pulley, but do I have to dig out bearings? If I buy new pulley does it contain the bearing or do I buy them seperately? I want to have the parts handy before I start.

Thanks.