Step 1: acquire rock
Step 2: get some fluid to mix it with (got it at 7-11 on the way to a safe house)
Step 3: Crack off a chunk, crunch it up into powder, and put on spoon
Step 4: Put a little of the fluid (don't know what it was) on spoon
Step 5: Apply heat to spoon
Step 6: Suck crack-filled fluid into syringe
Step 7: Inject crack-filled fluid into body
Step 8: Lay down and enjoy

Worked great! Me and my friend let two black dudes handle it all, and they were obviously pretty practiced at it, knew all the stops to make for the fluid, the syringes, had a place to do it, and they were as good at injecting as any nurse or doctor I ever met.

Was that the 'incorrect' way to do it? Seemed to work just fine. Hard to imagine there could be a better way; the rush was just indescribable. And no, I do not have a lot of experience with injected drugs. That one time, that one night, was it. So, even if that was 'wrong', the way they did it, I'm not going to do it again to 'get it right'. Judging from how many track marks the two black guys had, this seemed to be their normal way of using.