How to I go about getting my Chevy Equinox! Negotiating and other things????Help!?

So on October 19th I will be walking into a Chevy dealership by myself ( I will be 18) with my checkbook to get my first car in my name (my other car, gas guzzler is in my moms name).
I dont know how to go about this I have already test driven a 2010 chevy equinox so I know thats the car for me.
But I dont know how to negotiate….the price of my car with the accessories and the model that I got comes up to a little over $32K.
How much do you think I can get a salesperson to go down? I will be paying for the car in full so no monthly payments.
If it helps I live in Maryland and I have my Provisional license (they will sell you a car even if you have a learners as long as your 18, my friend got his car when he was 19 and sadly only had a learners)
How much do you think I can get them to come down off the price, I have looked at edmunds but I just needs other advice.

If your a wheeler dealer you can probably get them down 10 to 15%