how do i get used to anal?

I got a butt plug and tried it with my partner, it went horribly the first time. Felt so nauseous immediately and had to take it out and sit on the floor for a while. Embarrassing, obviously.

We tried it again recently and it felt fine! But i kept pushing it out, so it was a little bit awkward? I liked it, and have previously liked having like a finger in there, but I still cant imagine a whole dick. Lmao.

Just wondering if there are like any tips for this.

Edit: oh wow. Did not expect so many comments lol. I want to say first: Thank you guys for the tips as well as the concern of whether or not i genuinely enjoy this. I think i might just want to enjoy it? Like I like the idea of me liking it? Not sure. But thank you all :)