Here's Alan Davies showing how to do it
That’s a great idea actually! It’s so long I could practise several times before the final cut!First time you could not take any length of at all but practise cutting into the mane to trim the edges to decide what sort of finish you like. Go very slowly and do a little at a time. If you are not going as short as you want to, there's plenty of scope to fix.
I don't go as neat as Sasanaskyex but a slightly more uneven look as if the mane hasn't been trimmed but happens to be short but it's all personal taste.