When I started as an Assistant Scoutmaster, I immediately bought and read the BSA Scoutmaster’s Handbook cover-to-cover. What a disappointment. Too heavy to take with you and not much useful in it anyway. It doesn’t describe the responsibilities of the Scoutmaster or any of the youth leadership positions. You don’t even need it for the copies of the forms—those are all on-line now.
If your walking shoes are a year and a half old and the cushioning is stomped flat, get new ones before you go. You’ll be doing a lot of walking on concrete and terrazzo. My feet hurt after the first day.
Allow a lot of time to get places on the Metro. We rented a house in upper northwest, so our route to The Mall was to drive about a mile, park three blocks from the Friendship Heights Metro station, walk there slowly (with boy and dog), change trains downtown, go another stop or two to some part of The Mall, then walk to a museum. This took almost exactly an hour.