How do I start trading on Dex?

Excuse me, could you please elaborate on the process of initiating trading on a decentralized exchange, or Dex? As a novice in this realm, I'm quite intrigued by the concept but unsure of the initial steps to take. Could you guide me through the basics, such as setting up an account, connecting a wallet, and understanding the trading mechanisms unique to Dex platforms? Your insights would be invaluable in helping me embark on this journey.