God, I waited and waited for my DD to self-wean. Everyone around me was so confident she would. She was interested in all sorts of food. She was generally a busy, interested, curious toddler. But she would not give up feeding to sleep, and would wake for a feed in the early hours without fail.
I was desperate enough to wean her myself, and tried the gently gently approach recommended by BF associations with no effect. As far as she was concerned, there was no reason to give up what she loved to do.
At twenty months, a light bulb went on in my head and I sat down with her one day and said, we are not going to have [read family nickname for BF] any more. Mummy can't do it any more, because [read whatever reason you have - I had an operation looming]. SO we have to stop. Tonight we are going to have extra stories instead of BF, and if you are still not sleepy, we can go for a drive OK?
It took about a week to give up BF at night, and yes, we were driving her to sleep on and off for a couple of months, but I made a game of her new bedtime routine, we had a special song for pyjamas - teeth - stories - sleep. This somehow made it all new and interesting. And now she had a reason to stop.
There are books, advice out there on managed weaning, but you have to really seek them out and I found most tailored to smaller babies who could not understand more than basic reasoning. I could not believe how quickly my DD understood, once I presented it to her as something that was just part of life, and she just got on with the business of relearning how to get to sleep. Sometimes I feel we don't give little babies enough credit.
Most BF counsellors I spoke to were of the gradual weaning thinking, but were sympathetic, so don't be afraid to get counselling. It can help to just moan to someone. Weaning is kind of emotional, as it is a big break.
Whatever you do, don't tape up your breasts, or slather them with something nasty tasting! Someone will suggest this, I guarantee!