@Felthry so your two big options are laser and electrolysis.
Laser is faster, less painful, and less expensive, but the results are more variable and it generally only works with darkish hair and lightish skin. I'd say the pain level per pulse is about equivalent to being snapped hard with a stretched rubber band. Definitely unpleasant but generally bearable. The quality of laser and pulse intensity used vary from clinic to clinic. You want to be using the maximum power that doesn't damage the skin.