If you really think he's ready, clear your calendar and plan to stay home for a few days. Get him some big boy underpants, some training pants (they're thicker), put his little potty close to his toys or the tv, give him plenty to drink, and every 15 min or so put him on the potty. Make a big deal when he goes on the potty. Once he's gotten the idea you can start working on limiting liquids (especially before nap time) so he'll have fewer accidents (but be prepared for accidents) and move his potty into the bathroom. When he has an accident, change him in the bathroom and put any poop in his potty then flush it and tell him this is where it goes.
If he won't sit on the potty for you at all, don't force it. Just wait and try again in a couple of weeks. In the mean time, there are plenty of kids books and videos on going potty.
at 3:20 PM on Jan. 21, 2009