The more turned on you are, the easier and more enjoyable butt play will be. Watch porn, listen to an erotic story, or just close your eyes and fantasize. A hot bath before anal play will help loosen tight muscles and increase blood flow to all your bits.
Use bath time to give your erogenous zones a good rub-a-dub and show your anus some love while you wash up. Sex toys can help you get a feel for anal play before experimenting with your partner.
Take things slow and enjoy the feeling of the toy teasing your butt before inserting it.