dotcommomma and others: I've never used any "method" for nightweaning (I'd hate to 'fail'.) The Baby Book is always my resource for ideas and then trial and error. One thing that made it a little easier for me with dd2, is that when I had to make a couple of business trips, she did just fine with DH!!! So she could sleep without momma's 'nursery'! This helped me relax and know that we could do it.
With dd1, when she would go from 9pm - 4am without nursing, that was nightweaning for me. That's 7 hours without mommy milk, she gave up the 4am nursing around 11 months. btw, dd1 did all this on her own.
dd2 was a little different (I wohm.) She was a reverse scheduler and a very avid night nurser. When she was 18 months old, I got a promotion, we had to move and I was working 12 hour days. I couldn't keep up with the all night nursing. Since she was fairly verbal, I started telling her that "we're not going to nurse in the bedroom anymore" I'd nurse her all she wants in the living room before bed, but not nursing to sleep or during the night. It took a couple of weeks, but she understood it. DH would sleep next to her when he came to bed. She fussed a little & some nights she asked to sleep on my chest, which was fine. Also, up to that point I slept without a shirt on to make night-nursing easier, but I started sleeping in a t-shirt. All in all, it took a couple of months to get it completely done. We still cosleep too.
Don't know if this is helpful, but get as many ideas as you can and follow your heart!! I couldn't take time to read all the posts, but there are a lot of wonderful mommas here with some wonderful advice!