As Stoatsngroats said it's best to get familiar with mending a puncture in the comfort of your own home.
I looked at the tutorials on Brilliant Bikes and kept promising myself to have a go at removing and reinstalling the back wheel.
Lockdown has given me that opportunity and I'm so glad I have gone through the process. The first time was awkward, especially with the chain tensioner, now I've done it a few times, most recently swapping to the new Brompton tyres from Continental I feel a lot more confident.
You could always practice the fold/unfold too, I hear the record for folding is just over 5 seconds 😯