Hi S., At 2 1/2 he is kind of set in his ways, so you are going to have to be a little firm. With my first child he was 20 months old when i started him he loved the Price Is Right so I let him sit on the potty to watch that, I figured in an hour something was bound to happen. For reward I bought a big bag of M&M's and I put them in a really pretty clear jar and I sat it on the top shelf of our book case where he could see them, and i told him when you go potty on the potty you can have some M&M's, iused regular cloth training pants no PULL UPS, and the first time I put him on the potty during the price is right, he peed, I praised him, and huged him, and gave him 2 M&M's, I don't remember how much time I ket go by before I put him on the potty again probably every couple hours, and he had a couple acidents starting off, but Once I knew he understood the concept, he was disciplined if he peed or pooed on himself, and I am happy to say that during potty training he never pooped on him self and he was only disciplined once and by 21 months he was completely potty trained I took him to the store and I let him pick out his own big boy underwear, he was so proud of those. My second son was even easier because at 17 and 18 months he wanted to wear underwear like his brother, so I told him the way he could wear underwaer like his brother was to use the potty like his brother, at this point my son was 3 so he was using the toilet, but my other son started sitting on the potty I used the M&M's method with him, no discip,ine was necessary with him and by 19 months he was completely potty trained, my daughter was 22 months and completely trained. It was a great experience for me and my kids, they love praise, they love encouragment, and they loved those M&M's., J.