Hi early25,
I'm going to reiterate something that Marty mentioned in his post - sometime real soon, you will have to overcome whatever apprehension you might have about this process (being 'scared' is not an option). Everything about training for the GMAT, taking the GMAT and applying to Business/Grad School is standardized, which means you CAN properly prepare for all of it. You've now posted twice how scared you are - that has to STOP.
You know what the score goals are and you know the deadline, so it's time to get to work. However you choose to proceed with your studies, remember that there will be lots of little 'steps' - you won't be perfect at everything all at once, so that should not be the goal. You might also need a bit more time to get everything done, but you have that time. From what you've described, you would likely benefit a great deal from investing in a GMAT Course of some type (Guided Self-Study or instructor-led), so you should take a day or two and investigate the options.
GMAT assassins aren't born, they're made,
Rich