Out on the Maximus trikes, we often get "You want to get a motor on that!"
Just once, we got "You want to get a pony for that!"
With regard to re-learning to ride a tricyle, if you find it tricky (and many accustomed two wheelers do), find yourself a nice large flat space, like an empty car park, and practice riding really slowly. Straight lines at first, then corners. Get used to the idea that you don't need to put your feet down when you stop (something a lot of people have trouble shedding the instinct to do), or go very slowly. Cover the brakes. It'll soon come.
The cyclecouriers in York used to hire their Maximuses out in rickshaw configuration to school fetes. Apparently, two of them would set off, towards each other, from opposite ends of a playing field, with 2 or 3 kids each in the back. They'd each ride, looking over their shoulders, telling the kids how important it was to look where you were going, and how the kids should shout if they saw anything coming. The kids would be squealing and pointing at the oncoming rickshaw, while the rider continued not to look.
At the last minute, by prearrangement and periferal vision, both riders would execute 90 degree left turns to avoid the inevitable. Since a Maximus can turn in it's own length, this was fairly effective.