Just also wanted to say that 7 months is NOT too late!
I started when my DS was 12 months (my little co-sleeping bub had gotten in a rut of sleeping no more than 45 minute stints - including at night time!) We implemented so many BW things at the same time then (schedule, extending naps, sleeping longer at night, sleeping in own crib, etc). For some reason we never pushed the falling asleep independently - we were still staying in his room until he fell asleep though.
Now at 22 months, with the help of BW we just got him falling asleep all on his own - not in his room or anything - in 2 days flat.
See - you are actually starting EARLY at 7 months - lol!