I can't recommend the following book enough if you're coming from a working class background:
http://www.amazon.co...e/dp/1566392918
Good luck not crying over the last chapter, though.
Even if you're not, finding allies is extremely important. And in my experience, most everyone will likely have little understanding of your lived experiences. I often find my colleagues have much better understandings than I of the system and the hurdles to be crossed. I try to be as open about my ignorance of some of this stuff as possible, and it seems to be working well. Finding an advisor that understood where *I* was at was also crucial to the success I've had.
I think the most difficult part for me has been coming back home for the holidays. My folks don't understand what I do, and I come home speaking leftist polysyllabic gibberish. They're incredibly supportive...but its been a bit alienating with relatively well off colleagues on one hand, and my parents on the other. The socialization of academia has been transformative, and I don't think I was ready for it when I entered my program. I'm still kind of not ready for it.
But I'm doing it. And so will you, if you choose.