first pls don't go to shell auto shop/body shop or jiffy lube thats already a bad sign, go to your dealer its not the best but atleast they know and have experience on your lexus gx. second you'll need to learn how to do basic maintenance by your self, get a FSM learn how to read it, buy tools it don't need to be snap on or craftsman a harbor freight tools are life time warrantied also, battery that cost you $500 better be a damn good battery, you should have asked a friend to bring tools & buy you a battery and bring it to you it wont even cost you $120 for a autozone battery.
