Anything that's different from your own realm of experience as a human being, whether it's driving a car or a boat, or using guns, anything that separates you from yourself and leads you more towards this character's existence is a big help.
When I was in Philadelphia during the Depression in 1930 or '31, I got a very sad job as a night watchman in a garage. The cars in the garage had been abandoned by their owners, since they had lost their jobs and couldn't keep up the payments.