Instructions:
1. Ask OP to sign wallet address that he really got 3k $ btc

2. Ask OP for escrew.
3. Under any circumstances do not send as Fnf .
People actually use bitcointalk escrow "members"? Havent you ever heard of I dont know....localbitcoins? Paxful? Localethereum? Jeez lol
I believe yourself. But there are lots of money as you said already $3000. So in this case I think you should increase trust level. But if you use bank method to exchange would be nice. In this way risk level will decrease. Besides, you can try with exchange websites as I already input like
https://exchange.all-stocks.net. Hope for the better. LOL!