My son is 2 1/2 and is completely potty trained. One of the things that we did was we had a "potty party." We talked about it beforehand and prepared for it. What a potty party is is a celebration of no more pull ups - only underwear and using the potty. We got a cake, balloons, and invited a few friends and family who brought "big boy" gifts such as underwear and toys. Then we ceremoniously threw out all of the pull-ups we had left (actually we just bagged them up in a trash bag and put them in the garage, but he thinks we threw them away). No pull-ups in the house means no more diapers for him! He was excited about it because we were excited about it. We had a couple of tough days while he was learning, but he didn't approach it any other way than "This is where you go now." We didn't look back or put him in anything other than underwear (because we didn't have anything else - even at night). He'll get it - you just have to make up your mind that your going to see it through come hell or highwater!
We also made such a huge deal out of any time he went in the potty. We clapped and hurrayed and called Granny and his Aunt and Uncle, we took his picture - I mean we made a big deal of how big he was and how he could do it! His dad was instrumental in teaching him to poop on the potty by modeling it for him too. When he had an accident, we made him help clean it up, change himself, clean himself, etc, and emphasized that the potty is where the pee pees and poo poos go, not in the underwear or on the floor, etc. We limited his drinking after about 6:00 and had him go right before climbing into bed at night. For the first few weeks, we woke him up about 20 minutes before his normal time to sit him on the potty. Sometimes he went back to bed, others he didn't but at least we helped with the first-thing-in-the-morning accidents.