nell, I was really dreading it, but it was easy. One day i just decided enough was enough with bottles (and i was fed up sterilising all the time) so just made up the milk in a sippy one morning. It was one that required quite a suck to it, (boots bottle to cup trainer) I bigged it up and said "look, here's your milk, all ready for you in this big boys cup" and he took it! We have never looked back.
I keep giving milk in the trainer cups, and for water/juice he has the straw cups now most of the time.
I kept the nighttime bottle for a bit longer (mainly because i thought if he had no bottles at all my baby would be gone) and yes the little baby is gone, but replaced by a beautiful independant feeding boy!
Be brave! and do it, (but have a bottle on standby just in case!)
lili xx