you are getting really supportive answers :).
My favorite weaning advice was that nursing should continue as long as the mommy and child want to--and believe it or not, two of my kids weaned before *I* was ready, and I had to remember that that equation worked both ways ;)!!! Nursing around the world apparently is more likely to end around 4 than around 1, so ... who knows?? there is no 'normal' ...
the only child *I* weaned, actively, was #1 ... but you've had most of the advice I used (stretch times a little longer all the time, take advantage of whatever activities you are involved in to distract her) ... make sure she never has a trauma about it (if she gets a big scare or injury and you aren't yet all the way weaned, for instance, I would probably make an exception ... but I would also try to redirect her attention from the breast as soon as she was showing signs of recovery, so it didn't turn into a feeding).
I particularly loved the advice here that starting in the morning, when she is less tired(/fragile), works better ...