If you're having this much trouble already, be prepared for hell. If you're anything like me, you'll develop a love/hate relationship with the game. Even when frustrated, the game will compel you.
Having played many hours of this game, I need to make a suggestion to new players:
There is software the in the game that lets you save the messages you get from tablets. If you have an excellent memory, you can always use the software, but I would actually recommend writing down/typing/taking photos of these passages with your own pen and paper or smartphone camera. Honestly, while not all tablets have absolutely pivotal info that you couldn't figure out on your own, the kinds of hints they offer are generally very important, and forgetting a single detail can trip you up. The game is so non-linear that you can miss one thing and then make a bunch of progress, only to hit a brick wall because you missed one tiny hint from earlier.
This isn't exactly what happened to me, but if I knew at the beginning what I know now about the game, I would have started off in the very beginning by taking down all information that I came across. Not necessarily with environmental objects (which you can just take note of), but with tablets that have hints and describe aspects of the ruins.
It's a lot of information, but having it on hand may save some headaches.