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I remember being equally mystified, but believe me, it does come, and being a microbiologist, you're certainly no dolt when it comes to technical subjects! It's just a matter of putting in the time to read the introductory pages on astrophotography.
If it helps, PHD is software (it's called 'press here dummy' - really!) that helps keep your mount pointing in the right direction via a feedback loop with a secondary (guiding) camera that takes shorter exposures than the main camera, typically 2-3 second exposures.
Subs are just images, typically part of a similar set, the idea the subs can all be stacked together to reduce noise and amplify signal.
Gain is just a camera setting like ISO, and HA is Hydrogen Alpha - one of the emission lines of the gasses in nebulae (if you put a filter that only passes Hydrogen Alpha, then you reduce noise once again by excluding light of other frequencies).
Hope that helps some.
So what does 'G+ / Ox+ and no - EMB Growth' mean? I'm curious :-)
Cheers
Markus
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