DS1 TTed himself at 2years 4 months old...over night
DS2 TTed himself at 4years and 1 month
DD1 TTed herself at 25months
DS3 is 2 1/2 and there is no way he is ready to TT.

Im not into pushing my kids into it....I tried with DS2 and it back fired and look how old he was when he eventually TTed.
I wait until they show an interest in their 'bits' and then i casually pop a potty in the bathroom/toilet when I go to see what happens.
I let them sit on the potty/toilet with their nappy on so they arent affraid of it and then they were cosy with it, I showed then to sit on it with taking their pants of.

What works for me wont neccessary work for you. Every child is differnet and I think there is way to much pressure put on us for our children to TT once they hit 2.

I hope tha tyou find a solution that your both comfortable with and that works well for you. Your doing a fantastic job trying everything, please dont doubt yourself