I am helping a friend re-model a house built in 1920. After reading all the posts re: paint, I see mention of testing paint for lead. Can someone explain that? I called the gov't. # about lead base paint and they recommend replaceming the doors and trim in question. We want to remove old gloss paint (I am guessing it could be as old as the '50's) which is terribly chipped and re-paint, using primer and then latex semi-gloss. We have 2 doors in the room we are presently working on which can be worked on outside but the frames can only be done inside with ventilation.

What safety precautions and products/methods does anyone recomend?