I’m booked to test drive a (used) car from a dealership, let’s say it’s for sale at £9000 and ideally I don’t want to spend much more than £8000-8500 max if I can. I’ve already made the mistake of saying I’m a cash buyer because the salesman asked if I needed finance or a part exchange and I need neither and I couldn’t lie. I’ve now learnt it’s not good to offer this info up straight away 😂 I’m clearly a novice car purchaser 
If I see the car and all looks good, how do I go about negotiating on the price? Do I test drive then ask what’s the best price they can do for me?
Unfortunately I have no one to come with me who can give it a second pair of eyes and I’m not the most confident in this situation.
Any tips or advice most welcome!