Please recommend a self-hair removal method for the upper lip.

I don't really bother removing my upper lip hair or beard.

It seems my daughter is worried about her facial hair these days.

It seems like it is especially darker in growing kids, maybe because of hormones.

They asked me to remove hair before going out today, but I don't have the right tools.

I had a new eyebrow razor, so I used that to remove the hair.

It looks like it turned out neat for now, but...

I applied plenty of moisturizing lotion beforehand because I was worried it might irritate my skin, but

I think eyebrow razors are too harsh.

What are some hair removal methods that won't irritate sensitive adolescent skin?

Or maybe plucking would be better than removing the hair...

Besides men's razors

For example, there is a hair removal device for the upper lip exclusively for women.

Are there other low-irritation methods?