Bloody hell! My wifes trying to potty train them at 2 no wonder shes finding it hard!
I wouldn't even bother at 2, seriously, there is no rush. Don't make life harder for yourselves than it needs to be. I go by if they have accidents all the time after the first few days to a week then they're not ready really. It shouldn't really take longer than a week for them to understand but I don't think 2 year olds really understand.