The basic piece of safety equipment for workers exposed to lead dust is a properly fitted half-face respirator equipped with purple HEPA filters. Many do-it-yourselfers can use an N100 series disposable respirator, but mustaches and beards present a special problem.
In this video, Robert F. MacDuff and James L. Scott, C.I.H. of EnviroScience Consultants inc. [sic] in Newington, Connecticut, explain some procedures to be followed for proper fitting and maintenance of these breathing protection devices.
There's a lot more information you need to know about lead-paint removal. For a start, read Tom's article, Lead-Paint Safety, at Home and on the Job. For an online directory of professional fit-testers, visit The American Industrial Hygiene Association at: www.aiha.org.