That is the problem these days. Because there are a lot of people out there just looking to scam ad cheat someone, the honest buyer/seller gets screwed.
I remember my dad selling a caravan via Ebay, I told him not to do it, that it was a scam waiting to happen. It was the only Ebay transaction he ever did and it went 100% fine - people turned up, gave him the cash and took the caravan.
My now brother-in-law sold a classic Mini to a guy in the US. He contacted my BIL who immediately thought scam. However a bank transfer took place and then two weeks later a shipping firm came and collected the mini to ship it to its destination.
For safety OP - face-to-face and cash is the only 100% safe way.