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Genius Guides are from Rogue Genius Games. As far as I know, they don't have a dedicated team working on their materials for HL.
As far as entering it all yourself, some parts are easy (making the text show up in a Feat, for example). Scripting to make a Feat or Class Feature actually do calculations can vary a lot in difficulty. I would suggest you take a look at the first couple of posts in the Community Pack thread.. ShadowChemosh, who manages the pack, has a number of useful links in his signature.
Also, there are threads from the HL developers on "Scripting 101" and such topics that should help you get started.
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