my son is really really late he will be 3 in december, he is really really sensitive, one day about 12months ago he had a nappy off did a wee wee, even though i congratulated him and said wow thats how daddy does his wee wees he went absolutely ballistic! it really scared him. then came the day he did a poop without a nappy, went ballistic again.
so to get him over the poo poo thing we kept showing him his poo poo in his nappy, the wee wee thing well still working on it really. a week before our newborn arrived he showed interest in his potty for the first time ever, so i though right get him to wee on it, he was desperate for a wee, went to get a nappy, i stopped him put all the nappies away and said basically he was a big boy etc etc potty etc etc honestly he was absolutely bursting when we started, 5 hours later he finally did it purely because he couldnt hold it in any longer. not ideal and the reason i didnt pursue training after that was because well our baby was due that week and i didnt want to risk him getting a urine infection from holding in his wee like that
so my advice would be, make sure he is truely ready, go at his pace.
the important thing everyone will tell you is to have patience and never ever tell them off for having an accident. i have looked into reward charts for my toddler
2 weeks ago i said to my toddler right we are buying 2 packs of nappies once they are gone we are potty training, he is defo ready, he puts on his own nappies for crying out loud! and i am not talking pullups lol