I think the guidebooks don't work well for Antarctica because their purpose for a "normal" travel destination is to give you suggested itineraries, some logistical tips, options for activities, site, food and lodging. In Antarctica, those choices are bundled together in whatever the package your cruise sailing offers. Almost every traveler to Antarctica will be part of cruise or at least a guided tour, which, by default, are trips that are planned out for you. You don't see that many guidebooks on cruising; blogs or articles about Antarctica are more choosing the right cruise, rather than "don't miss out on" seeing this or eating that. Even major "sites" may be missed because weather conditions don't permit a landing or experience.

For my Antarctica trip planning, I was lucky that a coworker's previous job was doing sales for the NatGeo cruises. She went on their Antarctica cruises as part of the job, but as a customer rep, she knew the common issues any Antarctica traveler dealt with. The big things to consider and watch out for:
- Ship size matters, as been repeated any times in this forum. Less passengers = more potential sites due to landing capacity rules
- Buy travel insurance with minimums which covers emergency evacuation and repatriation. I think generally your cruise will require this.
- Arrive in Ushuaia/Punta Arenas (or where ever your cruise/flight departs) at least one day before departure to account for potential delays. Ushuaia's weather can be unpredictable and domestic flights in Argentina even more so due to cancelations and strikes. Both my domestic Buenos Aires <-> Ushuaia flights were delayed or cancelled (I was put on the next flight) by 3-4 hours. I was just glad we just got to our hotel late, and neither resulted in spending an extra night in that city. Also, the travel insurance you purchase needs to cover the cruise since, like any other cruise, the ship will depart without you, but unlike other cruises, there are no other "ports of call" to embark.
- The Drake Passage can be rough, and some handle seasickness better than others. Flying across the Drake would shorten the journey and be more comfortable, but flying is also more weather dependent and more prone to delays or outright cancelations. My coworker said she never had any customer regret going to Antarctica because of the crossing.