Amen! On the one hand, it's daunting realizing that we might give all this up (I too have a nice paying job, home, friends/family) and it's even more daunting because it's not just me... it's my husband, too. We'd move together (obviously). Ah! But, I think we're ok with it, and in a way it's exciting because grad school presents itself as not only the fulfillment of my dream but also a great opportunity for us to get out of our current city, which we both don't really care for apart from our friends/family/home/job.
I get nervous sometimes, but then I remember that the rewards (if I get in) will be great.