There seems to be a lot of people asking this question. With my first three kids I weaned from breast feeding fast and early, which I would NOT recommend either now. I'm still nursing my 9 mo. so I don't yet have the experience of weaning on older baby.
If you wean now you'll need to replace those breast feeds with formula till your DS turns 1. After that you can drop those feeds totally if you'd like and replace those with snacks.
If I were to wean now I'd just start with a feed at a time, probably with a mid-day feed and go from there slowly depending on how well my lo was handling the change. Maybe change a feed a week or so. So, depending how many feeds a day he's having it could take a month to complete.
I totally agree with the PP that you can stop the habit of nursing to sleep without giving up bf.
I know it's not always an easy decision to make. You've done an awesome job to make it this far so remember that too!
If you decide to keep going, post on the props board and I'm sure they can help you with the nursing to sleep association.

N~