How to buy injectives on Dex?

Could you please elaborate on the steps involved in purchasing Injectives on a Decentralized Exchange (Dex)? I'm interested in understanding the process from start to finish, including any necessary prerequisites or considerations. Could you guide me through the setup of any required wallets or accounts? Additionally, what are the fees associated with making such a purchase, and how do they compare to traditional exchanges? Finally, are there any safety measures or best practices I should be aware of when buying Injectives on a Dex? Thank you for your assistance.