Learning to ride a unicycle, might take you an hour or two to get 20 feet
once you understand that to pedal along on the flat you must be very gentle
with the pedals and sit up and look where you want to go.
Learning to actually control a unicycle will take a lot of time and effort.
Hovering on the spot is extremely hard work , juggling on a unicycle will take some real dedication if you want to make it last longer than 5 seconds.
Mine is in the loft, and 5 seconds juggling is as far as I got, hovering is great and feels really nice its just physically murder on the legs, trying to juggle at the same time makes you loose your balance, so is a pain ,
it also is not that impressive to an audience on its own.
As suggested above , why not try more interesting objects to juggle.
Champagne bottles are fun if you have the bottle
(nasty if they break)
Tennis bat and balls mixed looks good if you can juggle with clubs?
Fire is always the best for a reaction.
My best man used to do a strip tease on the unicycle as an act, bloody impressive .