I have three boys and they were all potty trained before they were 3. I was having problems training my 1st one. I was talking to my mother in law on the phone one day telling her that I did not know what to do that Nick just was not interest in the potty and I had Another due in 4 months and he would be three. I told her what I read on potty training and she told me I read to much and this is what I needed to do. I followed her instruction and he was peed trained in a week.
Her first advice was stop giving him a choice he will always chose what he knows (ie diapers over underwear).
Than she told me to take his diaper off and have him run around naked. (boys hate it when they pee on them self this is diffidently true).
She told me to sit the potty in front of the TV and have him sit on it every 10 minutes.(now this did not work for us my son refused to sit on it so we did like every hr.)
Once I got him to pee in the potty which took about a day than he was good to go and he was using it daily form there.
I used this method with all three of my kids the first one was trained at 2yrs. 9months. My second was trained at 20 months. (got smart and started earlier. Started introducing at 18 months) My third was trained at 2yrs and 3months when we were on vacation. (When my daycare babies came back He decided he wanted nothing to due with it and demanded a diaper so he could pee.) I gave it to him put kept talking to him and he was totally trained at 2yrs 8 months.
Hope this helps. I feel if you put the potty in the living room where it can be seen it helps relax the child and makes it more convenient and you have less accident at the beginning. Hopes this helps.