Doing blades or hot knives (goes by several diff. names) is quite easy to do.

All you need is:

A blowtorch, or oven, electric or gas will do
2 butter knives (work best, but 2 metal knives of any kid will do)
hash or weed
hooter (optional)

Now, you have to heat up the 2 knives extremely hot so the tips glow red, so that's where the torch or oven comes into play. Using a blowtorch, turn the heat on high and heat the tips of the knives with the tip of the flame (the hottest part of the flame). If you have a stove, just lay the knives on or inbetween the heating elements, so just the tips gets hot.

Like I said, a hooter is optional. Some people cut the bottom part off a small plastic coke bottle, and use the top section to inhale the smoke through. Some people use just a empty pen casing. Some people use no hooter at all and just inhale the fuming smoke.

So once you get your 2 knives heated red hot, get your hooter ready in your mouth if you're using one, and quickly pick up a small piece of hash/weed using the red hot knife. The weed/hash will stick to it if you lightly touch it with the blade. Be quick because it will start smoking. Take the other hot knife and squish the weed/hash inbetween the other knife, but have it close to your mouth or in the hooter ready to inhale, because it smokes and burns fast.

So yeah, just inhale the smoke but be prepared as it will send your lungs into an earth shattering cough fit.

Hope this made sense.

Have fun, good luck!