Avoid sanding
John in NM
Disclaimer - I have no idea, just using common sense.
I would use a chemical jelly stripper like the citrus stuff from Home Depot or the heavy duty stuff like Strip-Eze. The turpenes in citrus strippers are considered to be less hazardous, but again that is conventional wisdom rather than knowledge.
Once down to the wood, avoid sanding if possible, the dust is what would seem to be hazardous. If stripping is reasonably complete, the amount of lead in the dust would probably be minimal, but I would still do it outside with a mask on, and the day before a rainstorm if you can arrange one 
If you're repainting, you probably only need to worry about doing the stripping part.