What's the best way to cut the harness webbing to the right length?

When I first assembled the harness, I left it long but I cut it with shears, then used a small blowtorch to melt the ends to stop it fraying.
This left a few bobbles which tend to catch on the edges as I'm threading it through the buckle.

I was thinking that the ideal tool would be a hot knife to cut and seal, but the electric ones are quite expensive.
So my next thought was to buy a cheap kitchen knife, heat it on the gas hob and use that.

Any advice on the best method of cutting webbing to get a smooth cut?