oops sorry, private sale and from someone with little / no feedback elsewhere
In that case, nothing will give you any protection other than visiting the seller with cash and only handing it over when parting with the goods.
Neither Paypal or Paypal Gift offer any protection outside of ebay deals.
Bank transfer is not any better, once you have sent the money it is not easy to get it back.
If you send a cheque, the seller will usually wait for it to clear before sending the goods, how do you then get that back?
It is all about trust, if you don't trust someone why would you deal with them? How do you know that the item is as described, you have to take their word for it.
I offered to buy something from someone on here, they have sent the item before I have paid for it because they trust me, I have borrowed equipment and have lent equipment, to people on here some of which has been worth hundreds of pounds all because of trust, if you have a bad feeling about the deal, it may be best not to do it.
The other option is escrow: where you send the money to a 3rd party and they send the item to the same third party and when both have been received he forwards them on to the recipients. A lot of trouble and relies on someone else being involved and extra postage fees.
You pay your money and you take your chance!