Potty Training 1st Night - Help Needed

Potty training twins has been a growing sense of dread and fear deep in my gutt. We gave a half hearted attempt when we moved here this past Summer. However, neither Katie or Jessica were ready. So...we waited until the craziness of the holidays was over and presented the girls with two brand new shiny hot pink ergonomic designer European potties. (Bjorn) We made a huge deal of big girl potties, big girl panties, big girl plastic panties etc etc etc. We got the video camera out and videoed the whole thing. Both girls wanted to sit on them right away. So they did. We got some books and sang songs while we waited around for what we were sure was going to be nothing. All of a sudden Jessica looks up at us and gasps and in total glee she exclaims..."It's WORKING!" In the days of every toy having a battery or an on/off switch, she thought the potty was turned on and working because she was going pee pee. It was cute. Soon after Katie followed suit and there was much success and rejoicing.

In the spirit of college football, we decided that rather than giving candy or little toys, we would give the girls a small sticker with their name on it to place on their potty every time they have a success. You know how football players get to put a sticker on their helmets every time they make a great tackle, run or touchdown? Same principle. So we are off and running (to the potty). Jessica is doing great, Katie not so much. I'm taking my friend Caitlin's advice not to focus on both of them at the same time but to potty train the one who is ready and the other one will follow. Any advice out there in cyber space? Please share your comments.