Lead primarily enters the body via breathing in the dust while shooting, handling brass, or loading. Following that, it’s from being absorbed through the mucus membranes (wiping eyes or mouth) … and then to a much lesser extent, through the skin itself.
The best thing you can do is to do all of your brass processing outdoors in an N95 mask, or switch to wet tumbling while wearing gloves.
If the dust produced by a vibratory tumbler and separator is left outdoors, then it isn’t left as a fine layer of dust on every surface in the garage.
You might be careful to wear a mask and avoid touching your face as you process the brass and load, but that won’t be the case when you’re out there wrenching on your car next week.