Actually, I'd start reading the what are my chances thread, to help you get a barometer for how competitive it is. If you think you can cut it (honestly), hit the floor running. Talk to psychologists in academia, volunteer in their labs (dont volunteer at random other places and expect it to look good, it doesnt help at all, and neither does being the president of some bull**** undergrad club, IMO). Track down a private practice psychologists, ask them about their career, how they got there, etc. Maybe a VA psychologist, read their profiles ( I think APA does some of these, too). Get a variety of experiences from people in real life and off this board. I hypothesize that when people dont get answers from this board like they want (2.2 GPA, GRE of 990, no research experience, no articles, no presentations) they say "you guys dont know crap" and still apply to programs they have zero shot at, so I think it's important to ask these professionals that you see face to face (not just us anonymous people on here) how they got there.
Then, look into the finances. Figure out how you're going to fund grad school. Are you going to take out loans? Hope for 100% funding? Bank of Mom and Dad? Marry rich? Trust fund? Look into psychologist salaries, too.
FWIW I make pretty decent money for a first year psychologist, but I had a plan 6 years ago. It was to join a sleep medicine practice in the state I went to grad school. That fell through when billing for sleep medicine changed somewhat (more home sleep tests) and the finances of the practice changed alot and they could survive, but not grow enough to bring me on. So, consider things like that in your financial planning. Plan to have an average salary and see if that will work for you.
And finally, think about where you're going to practice and if you're willing to move several times and give up to 6 or so years post bachelors degree of your life to doing this. Daily, I mean, daily, you'll see people on this board say something that looks a lot like "well, I took an unpaid postdoc, and now I cant find a job in this one city I live in. I love this one city, and I'm unwilling to move or look for jobs elsewhere. Psychology did me wrong."