I have very long hair and usually get it trimmed every 8 weeks but do have hairdressing scissors at home that I use on my fringe around the 4 week mark.
I was due a trim on 24th March - the day after lockdown but obviously the hairdressers was closed down.
I looked up on youtube how to cut it. After washing, I put it neatly in two ponytails and trimmed about a centimetre off the ends with the fingers off my other hand holding the end of the ponytail and then did my fringe.
I'm actually really pleased with it and have saved myself around £35. I might carry on this way!