Don’t use any aides to get you hard. It will become a crutch.
Have something else special about the night. It could be as lavish as a trip to a somewhat upscale hotel or as simple as a bubble bath, candles, or a massage. Expect a very special night for the two of you - a night where you two connect in a way you never imagined possible.
But don’t expect it to be good. Imagine two monkeys riding a two-seater bicycle with no previous training - that comes close. This is not to say that it is going to be bad at all. In its own way, it will always bring a smile to your face. Just know that the fireworks and grand symphonics you are likely expecting are waiting for you at around the fourth or fifth time. As long as you both keep it fun and don’t expect too much from yourselves, it will be a great night. It just wont be great sex. Probably.
However, approach the night like you have a real chance of having the rare virgin/virgin sex that really is mind blowing. Don’t be a defeatist. As they say “prepare for the bad, hope for the good”. Well it will be fun and sweet and a completely bonding experience for you - that’s guaranteed. Anything more is a good bonus.
My only other tips are to involve a lot of foreplay. I’m assuming you’ve done everything except for actual penetration so foreplay is a safe area where you both know what you’re doing. A lot of foreplay is always good (and rarely enjoyed by men - bonus points for you) learn to see it as a required component of sex and learn to truly enjoy it. When she asks you to “put it in”, keep on doing what you’re doing for a little longer. Then follow her request. Teasing is good. Very good. Have a little bit of lube ready, but spit is the best lube there is. Not only is the application more fun but - well, that’s reason enough I think. You may want to joke with her that you’ve heard virgin/virgin sex is usually awkward. This will relieve a little bit of stress for her. I wouldn’t use the word “bad”. You don’t want to give her the impression that you are actually expecting it to be bad or awkward, and reassure her that you’ve heard it gets much better and its fun to learn - something to that extent. When in the process, eye contact is good. Lots of it is better. That deep, “window to the soul” sort of eye contact is best.
If you’ve never used a condom before (I suppose you haven’t, have you) go out and buy a practice pack. Practice opening that stupid little wrapper, practice putting it on, and masturbate with it. I know, its humiliating, but this is one of the better favors you can do for yourself. Get used to the sensation (or lack therof) of having a condom on. A bit of lube placed in the tip before putting it on is a good way to enhance sensation, by the way. You don’t have to be a pro, this is just a good idea. If you lose your erection while you are fumbling with the condom preparation, don’t be afraid to ask for a little help getting it back up. There’s no shame in admitting the obvious. If you feel yourself losing the erection or getting stressed or distracted just give her a kiss, look deep into he eyes and think about how much she means to you. There is no pressure - even though it may seem like the weight of the world is on you - there is no one watching you or expecting anything more than the connection you feel when you look into her eyes like that. That’s it. That’s all that is expected of you, and that comes without any effort so just enjoy the night. And have a pillow ready if you’re still living at home. Just in case you’re one of the lucky few…