[Closed] Selling a car privately, advice please

Morning all,

I'm selling my car privately via Gum Tree and wondered if there was anything I should worry about in terms of not being ripped off/having the car nicked? I've never sold a car privately before and am a little scared of the whole process!

The things that concern me are:
Payment. Is cash best? or bankers draft?
Test drives. Quite understandably they may want a test drive. How do you manage it? Do you go in the car with them? Do you ask them to leave something behind and hand over the keys?
Location. Currently said car is sat on my drive, is it best to sell it from there or would I be better advised meeting somewhere neutral?
Comeback after the sale. The car is, shall we say, temperamental. I've been upfront about this in the advert but if it does break down within an hour of them buying it what comeback do they have?
Receipt. Related to the above, is it advisable to write a "sold as seen" type receipt? If so, anyone have a suitable template I can borrow?!

Thanks all, and apologies for the long post.