I am going to wean my 20 month old (DS2) next week as I have just been given a scare by the HV about the problems bottles can cause with ears. We almost managed before xmas thenhe was really ill and it has escallated again.
DS1 had a bottle til he was 3, and he has re-current ear problems (including a burst eardrum - v painful 0 also he has a lisp which is more likely with a bottle aparrently.
anyway, I think from previous experience that the best way is:
keep offering milk in tippee cups, play games with it with teddies, mummy drinking it etc
then stop milk upstairs; have a snuggly bottle downstairs before bed on sofa. then say repeatedly no milk in bed, when they cry for it, repeat and repeat, give lots of cuddles, and expect at least two nights with lots of waking - we just went in and head stroked (or if this made him more cross just sat with him)
then a couple of days later remove ALL bottles from house (a bit like giving up fags!)
I honestly think the biggest culprit to him still having one is me, as I always think but how else do I get him to sleep... but he will learn (noonki prays!)
goodluck (to us both!)