I did this a while back. A decent smooth bit of empty road with a wall or lamppost to start from, ride one pedal stroke and fall off, repeat until two pedal strokes, then three…
I got as far as able to freemount and ride along, mostly, not very elegantly. There’s lots of advice on the internet but it basically takes a tonne of perseverance for someone like me who doesn’t have a great deal of natural ability.
Got rid of the unicycle last year after I realised I hadn’t ridden in a decade. Not so much flat road round here and the risk/reward gets less attractive with age.