I want to buy some BTC with cash locally, the seller i found says : "send BTC to your wallet. After 1 confirmation On blockchain, collector takes from the table cash."
Is this enough to be sure i will receive the bitcoin sold me? Or its better to wait for 2 confirmations?
Depends on it, I think 1 confirmation is fairly early to say it's safe because the transaction might fail. It's better to take the safest point than to lose your money, at least more than 1 confirmation. Usually I receive in 3-7 confirmations in several exchanges that I use.