K.A.
When I potty trained both of my boys they were each right at 2 years old but had been using the potty for a couple of months and it only took each of them 3 days to train all the way, even at night and for naps. What I did was leave them naked!! Yes, it makes a mess for a bit but very quickly they learn not to potty on the floor when they are naked and then when it came time to potty train all the way, it was just a matter of getting used to using the potty all the time and having underwear on. We tried the potty chair and it was a HUGE waste, not only did I hate cleaning it out each time the boys didn't care for using it. We ended up using the ring for the toilet and a stool. The little sheilds did seem to be more of a problem than a help, it got in the way more than anything.
Hope this helps, good luck!!