Hi! You could try cold turkey but this would be hard on both of you, so I think if it was me I would (will!) tackle one thing at a time - baby steps are easier to achieve!

First you need to teach her to go to sleep without sucking. I did this with DD1 (with the help of The No Cry Sleep Solution book) in two steps, firstly with the Pull Off, ie wait til the sucking goes from strong to fluttery then release the suction with your finger in the corner of her mouth & remove. If she roots vigerously, give in and try again when she gets fluttery again. Initially it took a dozen or more removals. However, after a week of this, DD1 would give in on the first or second Pull Off and drift off to sleep in my arms. After this I moved to putting her in the cot at this stage, ie awake but sleepy. BIG fight first night but then she slept thru for the first time in months, and she was more accepting thereafter, and continued to sleep thru.

When you're confident your DD's got the hang of it, and you're ready for the next fight, assuming you have a partner or parent who is happy to be left "holding the baby", I left DH with toddler and cup of milk, and went out for the evening. She wasnt pleased, but Dh was unable to give in and she knew it. She asked for a daytime feed the next day and I refused, and I went out the second night and she put up much less of a fight for daddy. Third night I lurked downstairs and she didnt fight at all. Im just hoping DD2 will be as easy!

Good luck!