Even a small amount of lead is poisonous to children under 6. Since your work is almost done you can test any undisturbed paint elsewhere to determine if there was any lead paint. The test kit I use is for before the paint is disturbed. Testing afterwards is usually done by comparing to a CV card. Most all paint stores, and the big box stores sell lead swab test kits, and a CV card available from National Lead Information Center, 1-800-424-5323. take a utility knife and cut little crosscuts into the paint to the wood and dab a swab on it. If there is lead it turns pink or red. If you have it in any other room it was probably in the one you worked on.
Cleaning is done with a damp disposable cloth to pick up dust and chips, use once and dispose of all cloths in heavy plastic bag. Start at far end at the top of the room and work down, every vertical and horizontal surface, floors last. Work your way out of the room so you don't walk in cleaned area. Vacuum the entire room, top to bottom with a HEPA vacuum. Vacuum must have a beater bar for carpet. solid floors use a detergent with a wet mop, keep wash water with detergent separate from rinse water. Change rinse water often. Mop a second time with a new mop.
Cleaning verification; use a white light flashlight and examine every surface for any dust or paint chips. Wipe down with clean, wet, disposable cloth 40 sq ft max per cloth. compare each cloth to the CV card if it matches, or is lighter than, the color of the CV card that surface has passed. If darker, re clean and retest.
As a contractor there is a $32,500.00 fine for non compliance.