Top Law Schools

Hey Guys,
I am currently studying for the LSAT and doing pretty well (166 on third diagnostic, with a little under a month left to study). I have a 3.42 GPA (cumulative) in International Relations from UC Santa Barbra.
However, once I am done I need to begin drafting a personal statement. Everywhere I go I seem to find different opinions about how to best go about this. Currently I am drawing a blank, I do not even know where to start. Ideally I would Like to get into UCLA or USC. My question is: Is there any specific advice I should know before I embark on writing? Is there anything specifically that I should be adding to to personal statements to differentiate them between schools? And is there any widely accepted format for them? Thanks in advance.

There is an excellent guide to Personal Statements on this site. I also found the Yale admissions blog very helpful. I would check that out even if you don't plan to apply there. As far as the writing itself goes, I started by jotting down a bunch of individual things I thought I might want to talk about, e.g. experiences, values, future plans, etc. I then took each one of these and did a miniature free write. It was really helpful for me. Good luck on your LSAT.