Actually most primers used in reloading contain lead styphnate. I would first advise the OP to get his lead blood level checked as a base line. I then would use latex or similar gloves during the tumbling operation. When pouring out tumbling media, he might want to use a 3M mask with the appropriate filter. I also use DeLead hand cleaning products. My lead levels have been very low. Of course there is the issue of having lead dust in your reloading area. There are HEPA vacuum cleaners that can help there.