idk why you would feel like you need to lie about it, but yeah I've bottomed before and I really like it. For tips I'd say:
If you don't already, practice alone with a toy or something that's similar in size to an average size dick.
Eat a diet high in fiber for at least a day or two before and/or use an enema 2-3 hours before hand. It helps keep everything as clean as possible.
Use plenty of lube. Seriously, don't be afraid of using too much at first. The friction of his dick sliding in and out shouldn't hurt.
RELAX. This one is surprisingly easy to forget about in the moment but learning to keep my ass muscles relaxed has made anal so much more enjoyable.