If you want to get rid of it, best time now and not when they are older! (just from what I have experienced as a nanny and other parents stories)
My son had a dummy from 4 weeks - 4mths. We went cold turkey, as in threw it away so were not tempted to pop it back in!
When he cried, we took to the system of going in and checking on him every 8-10 mins. As in he went to bed, fed, changed, right temp etc, he cried, popped in on him at 8-10mins to talk to him (didn't pick him up) left room and the majority of the time he would fall asleep before the next 8-10min check.
Took 3 days/nights to learn no dummy is coming and he would settle himself rather than using the dummy.
It is horrible to hear the crying, but I knew when he was put down he was ok, he just was wanting that comforter and our checking system worked for us.
Knew too many older children still with a dummy and was personally not wanting to get to that stage and deal with the battle then.