Most men skip this. That is why it goes wrong. Trimming without control takes off too much in one pass. Once it is gone, you are fixing instead of refining.

Set the comb flat against the skin first. This is your anchor. Everything follows from here.

Brush upward and keep it light. You are not pressing into the brow. You are lifting the longer hairs so they rise above the comb.

Move outward in short passes. The comb controls what gets cut. The blade simply follows. This is how you avoid taking too much off.

Clean lines. Nothing taken off you did not mean to. No overcut. No fixing after. Two minutes. Done.