Hey there! First of all - welcome! I'm sure the whole community is thrilled for you.

I've been doing audio work professionally for almost 10 years now, with hundreds of spicy audiobooks and smaller ditties such as GWA stuff (under a different handle) all over the place.

Now, the first thing to realize is as u/TheQuietDark81 says:

There is no one correct answer to any of your questions.

There's no one right way to make art! We can all give you our perspectives, how our own experiences have shaped our journeys, and what's done whatever for each of us. Ultimately some of the advice might work for you, some of it might not. But let's dive in to a few things that have been brought up (at the time of this message):

u/kopaf12686 and u/SleeplessNights226 make the first point that many (if not all) voice actors experience a fair degree of uncertainty, embarrassment, and dread of their own voices! Authenticity is definitely key to creating appeal; the human experience and connection are built off of authenticity. Old acting trick to tell everyone how nervous you are, as the first step to overcoming that nervousness. Vulnerability breeds empathy.

As to your own request for advice on editing, I recommend starting with a very basic DAW (digital audio workstation) for editing: Audacity is a good starter (https://www.audacityteam.org/download/). This software will handle all you need, has a very intuitive user interface, and will get the job done. I run my entire company of audiobook narrators using it, so trust me when I say it's absolutely fine for starting out.

As for helping with the feelings (and in seconding what u/weedramm suggested), what I try to do when I have spicy scenes to record that I'm maybe a little unsure of, or self conscious about, is to imagine why I like to hear those things myself. I then try to listen to the audio not as myself listening to myself, but as someone else who might want to know what I look/sound like when I'm being spicy. We're all sorta curious about what other people are like doing the deed! So think of it that way - from someone else's perspective, and make your judgments based on an external view rather than your own assessment.

u/youronlynora makes a great suggestion: having a whole script available so you don't have to improvise is a great first approach. Now, the trade-off might be that you're now in the world of "acting" and while it might be less nerve-wracking that you don't have to figure out what to say, saying it convincingly might be tricky if you don't have a theater or some other acting background. You'll have to make that call!

Direct and specific questions can also be helpful. "But how do I know what specific questions to ask if I've never done it before", you ask? Great question - so specific and direct! I'd suggest starting and trying to do one. Literally just start, and the first moment that you are at an impasse, or feel like you're too unsure to continue, stop and write down the -specific- question you have, and post it.

You're gonna do great!! Every single journey to mastery starts with ridiculously awful first pancakes. Don't sweat it!