If the base is too large for your balding area, what is the best way to cut it down WITHOUT cutting the hair you want to keep uncut on the top side?

Would the technique be the same for a thin skin as for a lace base?

I cut one new stock unit once with a razor and thought I did it right. My bald area is kind of narrow, 4" X 9 5/8. My stylist told me when I took it for the cut-in " Wow, you didn't leave me enough hair on the sides for a good cut-in."

Because the unit was so narrow, there wasn't a whole lot of hair on the sides.

Could anyone advise me on this?


Thanks!

Jimmy