I'm not much help because both my daughters weaned themselves around 14 or 15 months. They just lost interest.
Perhaps you could try just cutting back the nursing? Like maybe just keep the before bed one or whatever brings the most comfort. That was the last to go with both girls and I am sure they weren't even getting much milk at that point, but it still comforted them.
That said, if you do decide to definitely wean, dont feel any guilt! You've done great for a long time and the bf'ing will just get replaced with cuddles or some other comfort activity :-)
wife of my soldier Steve, mama to my beautiful girls Rowan (11/07) and Linden (03/10)!