If you do buy and pay through pay pal you will NOT be covered with buyer protection. Be very wary of buying from someone who says they will have it delivered to you but want paying first via pay pal or bankers draft.
Ask if you can pay Cash on Collection as sellers prefer this to avoid even more charges from Pay Pal as we but ebay rules do not allow you to advertise without offering the Pay Pal option for payment.
The majority of ebay sellers are genuine people, ask questions and go an view before making any type of payment. Even buy it now purchases will give you the option to pay now so talk to the seller first as they will probably want cash rather than Pay Pal then ignore the pay now button if the seller agree's to cash on collection.
All other advice on buying safely is appreciated.