Hot knives are pretty good. I like them for the efficiency, that's their big seller and they can get you pretty blitzed too. Put the knives on a stove top (you can also use a blow torch) until they're red hot, roll up little balls of weed, pick it up with the knives and squish them together. If the knives are hot enough.. you can usually just squish one of the knives to the weed and it sticks then press the other knife on it. The 2 litre bottle works really good, you can use whatever you want.

Funny story actually, my buddy does knives without a hooter. Just holds them close and sucks, it does work well but one time one of those burning hot knives slipped and stuck him one good on the lip. It was pretty funny stuff. Man that burn got ugly quick. Maybe use a hooter until you're more comtorable with them. And for the record, that's the only time I've seen or heard of someone getting hurt with knives.