my advice…. even if the school doesn't require the gre, the department does. we get so many calls from students saying, but the school doesn't require it, to which we respond, but the department does.
past that…. letters, get your letters underway now or asap, ask your writers to write them soon, send them a reminder after thanksgiving and a thank you note after the new year.
past that, most appllications are online, if you can do it online, do it online. it allows less bias into the system.
finally, don't get organized, just get it done, do one a week, get it done.