I agree with don't take the scissors to the forelock.
I bought a horse from someone whose wife knew nothing about horses but knew a lot about being a beautician. She displayed her hair cutting expertise by cutting the horse's forelock within an inch of the whorl under the forelock because it was "dangling in his eyes" and she couldn't stand looking at it
If that wasn't bad enough, she cut it straight across
While the natural taper eventually came back, I've owned that horse 20+ years and his forelock never has grown anywhere close to his eyes since that awful hair cut.
On days I am too lazy to dig out the clippers and trimming the bridle path is a last minute thought, I keep a lot of children's two inch scissors in a drawer in the barn. They are good and sharp for more hair trims than I gave them credit; they are very cheap to buy; their points aren't nearly as dangerous as real scissors; when I have to throw a pair out, I'm not stressing because they were cheap. Sometimes I can find them on sale at Walmart for 99 cents/pair
One of my horses has an exceptionally thick mane. If I use the kid scissors on his bridle path, it is thick enough that I can divide it into three sections (running horizontally with the mane). Once I get the length cut off, I can generally even things up to where that "man on a galloping horse" would never see the flaws