Davie,
I've put together this small scene that kind of demonstrates the technique (although it really sucks - hypervoxels are't really my forte), it's based on the techniques shown in the tute that you're following.
Essentially, once the ground, rocket and the exhaust light are placed, I added an HV emitter (through the FXBrowser - Look on the Utilities/Plugins/Additional menu in Layout) and parented it to the rocket. Then, just played with the particle settings until I'd got something looking vaguely rocket like.
Next, also through the FXBrowser, selected the ground plane and added a collision object to it to stop the exhaust simply blasting through the ground plane.
Finally, in the volumetrics panel, I added the hypervoxels3 plugin and attached that to the particle emitter, then played around with the texture until I'd got something vaguely exhaust-like.
Feel free to pull the scene apart, and if you've got any questions, just ask.
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