Eyebrow trimmers are a necessity, not an option.

Eyebrows have a significant impact on your overall impression, so I believe it is essential to carry an eyebrow clipper. I used to think grooming was difficult, but I found that simply letting your natural hair growth flow while trimming the stray hairs around it makes your face look neat and tidy. I bought one from Daiso, and even the Daiso one is perfectly usable.