Just be honest with your partner and just enjoy the experience because life is all about experiences.

and you'll be great. You already seem to have an awesome attitude toward sex, and that's really what counts. Remember that sex doesn't have to be a serious affair - the mashing of body parts is by nature awkward and funny, and it's always good to share a sense of humour about the whole thing. Don't be afraid to speak up and guide each other toward what feels good - communication is key. Good luck with getting lucky!

What you should do is put a penis in your mouth.
You're gonna suck at first.
Know why people suck at stuff?
They don't do stuff.
Mostly because they're scared of sucking.
Go put a penis in your mouth OP! :D

Practicing on a cucumber like when I first started.

You don't say how old you are...
If you are young, just learn as you go! Nice guys will appreciate any action they can get.
If you are a bit older, I would be honest about your lack of experience. Hopefully you'll get with someone who is patient and understanding. Giving great blowjobs take work and shouldn't be given to just anyone! I find most guys do not reciprocate! Remember to cover your teeth with your lips!

I have it in good authority that the Bad Girl's Bible (especially the blowjob section) may be of some use to you. Seems like you have nothing to lose. Some confidence may be gained by this (or at least some nervousness diminished).

Knowledge is power in more ways than one for your purpose. Google it.

...put anything in your mouth that you don't want to but just know that everyone is nervous at first. Perhaps you could say that you like guidance and instruction to your partner and see if you can just wing it on communication. Learning in a formal way makes you detached during the act in my experience.

talking and being able to communicate with a partner is key!! ask "does that feel good?" or ask them what they like....relax, go slow and enjoy!!

You never have to put a penis in your mouth if you don't want to. Just know that. If you want to try it, by all means. But don't pressure yourself. You don't have to do everything your first time. Your sex life, your choice. Be safe and when you are ready relax and have fun.

Wanna practice ? I'll take a hummer from ya