Buy the older editions, seriously. I didn't learn this until my last semester. I was too afraid I would miss out on stuff. I didn't.
Clep out. I don't know about your state but we had the option of studying and taking a CLEP test for our psych classes. If you are able to teach yourself by reading you will save a lot of time and money utilizing CLEP.
NCLEX. Don't read the detractors! Go though the study books and mark all the right answers. Then go through and read the questions and right answers. If you don't understand why that is the right answer, read the rational. Don't put all those wrong answers in your head.
It worked for me, take it or leave it.