There's no substitute for experience, but good books will help you get there a little faster. For example, in HU play I had been folding the button the majority of the time when I got a crap hand. However, it wasn't until I read Harrington's about HU play that I realized this was a mistake most of the time due to pot
odds, the probability that the villain also has a crap hand, and giving up position.
I would have found this leak on my own eventually, but reading about it helped me plug it right here and now instead of having it cost me chips continuously over some period of time. That said, the majority of the time where I have been HU in micro tournaments and
freerolls, I see other players make this mistake continuously. I have seen people fold the button 5, 6, 7 times in a row and allow themselves to get blinded out because they're waiting for a premium hand. For an absolute beginner it's counterintuitive to put any additional money into a hand like 62o because they're looking only at the cards, not at the whole picture.
You have to be careful though, some
poker books aren't worth the paper they're printed on. There's an OLP book by Scott Fishman (sp?) aimed at beginners that focuses more on superstition and lucky charms than it does on
pot odds.