I use tape and have tried various methods, including taping onto a scalp with about a week's worth of growth. It did not adhere well at all.
The first time I got a piece, I got it from a woman who sells them (expensively, I might add), and she removed the hair with a set of clippers that cut hair shorter than any clipper I've ever seen. It was almost razor-like.
I'd use a razor.