Remember the orientation of the liner as it must go back in exactly as it came out of the cylinder.  Sometimes there is a notch and pin, others you have line up the exhaust port.  When the liner is out, it is also a good time to make sure the passages behind the liner are cleaned up too.  I have even heard of fellows polishing those paths but not sure it does much for such small engines.

I would use a heat gun on the bearings, that loosens and sometimes melts the old Castor.  Castor is a great protective material.  So once the coating is removed you may find a good bearing after all.  But changing the bearings is not a big deal.  Get a set from Paul (the bearing man), they are in expensive.