Usually the last feeding to go is the morning or bedtime session, but I like how Victoria went about dropping those feedings first. My son still nurses every few days at bedtime (he's 2.5yo), and I know some moms don't have (or want) the option of letting her child wean themselves, but please make sure you go slowly. It's recommended that you drop one feeding every 4-5 days to avoid engorgement and possible mastitis. These can happen with sudden weaning, but it sounds like you have a couple of months to start the process.
Also remember that babies can't have regular milk until AFTER 12 months of age because their digestive systems don't have the enzymes to break down the proteins in the milk.
It sounds like you're a very loving mom, and I'm sure you'll find something that works for you and your baby! Congratulations on nursing this long, and enjoy your daughters!