didn't get one from Lidl, however I do have a Unicycle.
I can't ride it very well and it was a long time ago since I was riding it.
My tips would be practice, practice, practice. I learnt after some research on the Internet, youtube has some good tips. Somewhere with a post to help you get on at the start and a big open space, carpark, school playground, playing fields if they are smooth.
note, you will fall off (well I did), most of the time you land on your feet however the unicycle does shoot off away from you.
Hope this helps.
Enjoy it.
Nick