Well, I haven't in many years, but... [There's a distant look in his eyes for a moment, as if remembering something, but he makes sure to focus his attention back onto Joaquin.]

It's not so bad, once you get the hang of it. If this were ice, we could get you a chair to help you keep your balance, but that's a bit harder to do with a roller rink, I'm afraid.

[To his credit, he manages to keep from making a face as Joaquin struggles. Oh dear. Falling on your ass in front of a bunch of onlookers is probably not the best way to start the day.]

Try to keep your feet shoulder-width apart, bend your knees, and lean forward a little into a comfortable squatting position. Balance is key, and that should help keep you from toppling over.