For my son's 2nd birthday we converted to his "big boy bed" and got him new Thomas the Train sheets, etc. So I was hoping to have him potty trained by then. I also worked in a daycare, in the 2 year old room- which is when they potty trained.
Here is my advice: If you are serious about potty training, get underwear- and LOTS OF IT!!! And ONLY use underwear. With my son, I would give him some water or juice or something and take him potty every 20 minutes or so. Sure, sometimes we didn't make it and sometimes there were accidents. Pooping was the worst- but he finally got it. My son is almost three- and is pretty much accident free. The other day we had a bday party and he was too busy playing to stop and potty so, yes, he had an accident. But remember, it's just an accident- not the end of the world. Try not to scold for "accidents" because it just makes them not want to go.
Also, my son does not wear pull-ups at night because I cut out drinks after dinner and let him have a few accidents at first until he learned to wake up. Sometimes, though, he does wear a pull up at night because either he drank too much or we are sleeping somewhere else and I don't want any accidents- but he wakes up dry in those now! You'll be amazed at what children can do when they have no other choice. Take away the diapers- and pull ups... they are basically the same- and it shouldn't be too long!
Good luck!