take the wheel off my eco electric road scoota?

My eco electric road scoota has a flat back tyre - leaking valve I think. The one time it had a puncture the only way was to have it taken away by van and repired at a cost of over £50. Surely it must be possible to safely remove the wheel? My husband is very handy and has lots of tools but it isbecause it is electric that he has not tried. Someone must have fixed their own puncture? Can anyone help Thank you