I potty trained tre when he was 2 1/2. At age 2 I started letting him sit on the potty so that he could get comfortable with it, and told him that that was where big boys pee-pee and stinky, and for a couple of weeks when he would pee or stinky in his pampers...I would point out that babies pee-pee and stinky in their diapers and I would ask him where big boys do it and he would tell me "potty" then I would let him go to the potty (to show me where the potty was) I did all of this for a couple of week just so that he could get used to the potty and the fact that he was going to be a big boy soon and would have to use the potty.
Then one day I made a fun day out of getting big boy jockeys and throwing away the baby diapers (all young boys and girls want to be a big boy/girl, so they get excited when its time to do big boy/girl things).
Everyday without fail he wore his jockeys and every 15 minutes I told him to go and sit on the potty ( I also had his daycare do the same thing) I also told him to let me know everytime he wanted to pee or stinky ...Sometimes he still peed/stinky on himself and we would just clean it up with a tissue and put it in the potty (because that is where the pee/stinky is supposed to go) after the first two weeks he started to remember to go to the potty because they do not like wet jockeys/panties because it is very uncomfortable...Although every once in a while he still made a mistake.
I would say it took me a full month to get him potty trained starting from the day I put him in jockeys. After he was fully potty trained I started to let him go into the bathroom with his father to see how men stand up and pee (because it is less confusing during the potty training to let boys pee while sitting down). He got that down after about a week all the way down to the end where you "shake it shake it" lol and he says the words when he shakes (his dad taught him that part).
Even now he misses the toilet sometimes when he is distracted. And we are still trying to teach him how to clean himself properly after stinky.
But all in all, it takes alot of patience and consistency....Find a method that is comfortable for you and your child and keep at it until they get the hang of it, you can't start and then give up.
Also pull-ups are not good for potty training because they feel just like pampers.