Well, P., you don't say how far into two years old you daughter is - 25 months? 35 months? If she is still close to 24 months, I would say it is too early . . . As much as we look forward to not changing diapers anymore (and by the way, I had two in diapers twice), it was important to me to potty-train when they were ready and that it not be a struggle. With mine, I devoted one day a week to trying to use the toilet until they seemed to want to. For now, I would have the potty available, but not push the issue. You can also read books like "once upon a Potty." The one thing I did that I don't necessarily recommend now was to have an "open door" policy - my theory being that they would see what one does in there - but now I still have trouble finding privacy in the bathroom fifteen years later. Keep open to what may be the right incentive for your girls - for my oldest, a boy, he really wanted to wear underwear (what we call "chonies")- I told him that the rule in this house is that when you wear chonies you go potty in the toilet - and we sang the "wicked witch" song as we ran for the toilet - seemed to make it fun. On the other hand, I tried the chonie thing with my youngest, a girl, and she really didn't care if she wore chonies or not . . . They both potty-trained late, he was 34 months, she was 35 1/2 months. I don't remember potty-training my middle child - which I think means it went smoothly. My baby was for all intents and purposes trained and in chonies at 27 months, but my husband would put her back in diapers when she had an accident and she ended up back in diapers full time . . .
Good luck - and remember they are all potty-trained before they graduated from high school! =)