How to pay with crypto currency?

Hello there, could you please explain to me how exactly one goes about paying with cryptocurrency? I've heard it's becoming more and more popular as a payment method, but I'm still a bit unclear on the process. Do I need to set up a special wallet? How do I make sure the transaction is secure? And how does the recipient receive their payment in traditional currency, if that's what they prefer? I'd really appreciate your insights on this topic.