He Melanie,
My son is almost 3 and we just potty trained last month (successfully). Like you, I waited as others had indicated that it would just sort of magically happen one day (that he would want to go). Well, maybe if you wait long enough and they start to feel embarrassed that's true, I don't know as I finally stopped waiting for some "sign" and just did it. It wasn't that hard and I wish I had done it sooner. Took a good 1-2 days before he even really "got" what was happening when he would pee. After that, pretty smooth sailing and he has done very well.
At first, he resisted even sitting on the potty -- I think because he did not want to take the time out from playing to do it -- but, yes, I did "push" in a matter of fact kind of way that he had to sit on the potty as "wet underpants are no fun" (I said this over and over and over). The best advice I received was to plan to stay home for at least 2-3 days, no tv, dedicate yourself to the task -- don't plan to do much else over those couple of days, wear underpants exclusively (NO DIAPERS OR PULLUPS), and keep on a solid surface floor, if possible. :-) Also, as someone else said, do not get angry or show aggrevation at all -- just get "bummed" at an accident (it is a bummer, after all) -- I would just say, awwww, what a major bummer (with much sadness), wet underpants are no fun! Then, it was my son's responsibility to take off his wet pants, wipe up himself and the floor with a rag, put the wet things in the laundry, and get and put on dry pants. Then, we would "practice" going to the potty for the next time -- he would have to sit on the potty -- not to go, but just for a second, to reinforce that is where we should go to pee. He would have to practice a handfull of times with each accident. He did not like to practice at all (and fussed and cried), but again, I empathized rather than punished and agreed that it was a major bummer to have an accident.
I used the "Potty Scotty" training pants -- they are wonderful. Thick, yet they know they are wet. We still use them when going out for the day, just in case (helps keep the wet from getting all over). Just look for "Potty Scotty" online. We bought 12 pairs and I was wondering if it was overkill, but no, I certainly needed every last one, lol!
By the way, my husband was the one who ended up cleaning up the one very messy underpants mess. Now, my husband is one who can't even clean up dog poop from the yard without gagging. I had just gotten home from the store and as he was cleaning up, I couldn't help but laugh so hard at his reactions that I had tears -- then he started laughing, too. So, in a way, potty training actually created a great memory for us. :-)
Good luck. It's a messy couple of days, but then all good!!