We did it at 14 months. Got DH to take him the first coupel of night (over weekend), then I would take him til 4-ish, when DH took over and I got a break. Initially pushed the night feed back to 3 or 4, then not till morning. It took about 2 weeks before DS stopped asking for milk at night.
It didn't stop him waking up. And he was still hungry, and we ended up feeding him bananas instead (I weaned to get my cycles back, or else I would have just gone back to breastfeeding).

You can try cutting feeds shorter and/or pushing them back. You can tell him the milk sleeps at night time or something similar. Getting daddy to take over at night for a while can also be a good tactic.

Good luck!