Step 2: Kaboom!
Light the lighter, and hold it with the flame until it (the black plastic loops holding the striker and valve in place) starts to melt. This takes perhaps 30 seconds, maybe a minute. The metal striker will fling off, and soon after that so will the gas valve (A metal -thing- which is connected to the red button in the picture. When this comes off, so does the button). When this flies off there will be nothing stopping the gas from leaking out, and it will! At this point, place the lighter in a sheltered place (away from wind, and also away from anything (else) flammable) right way up. There is no need to rush as the flame will continue to burn at normal height for at least another 30 seconds.
Make sure your goggles are on and stand back a meter.
A jet of flame bursts out of the side at the top. This is pretty spectacular, especially if there are more than one jets. Take in the view for 30 more seconds and BOOM!
*Note - try souping up your lighter to speed up the process (this is the only way to reliably speed it up)