First of all, I think you're doing great. There's a learning curve. You're learning, your baby is well cared for. Don't over stress. No one is perfect at parenting. One day without enough napping isn't going to hurt your baby. Make your mistakes, learn from them, move on to new mistakes.
I remember when I was in college my dad said something that really stuck with me: "The thing about being a parent, is you look back and you think about all the many, many mistakes you make, and then you look at your kids and think, how the heck did they turn out so well?"
I also like some of the opening paragraphs of this article. It's specifically about troubleshooting naps, and I stumbled upon it when I was (duh) struggling with baby naps, and I had a similar attitude of you - I can't do this right, I need someone else to come teach me! I don't know what to doooo.
https://www.babywisemom.com/naps-troubleshooting-revised-and/
And her point is, basically, that troubleshooting these early, relatively easy/low stakes issues teach you to troubleshoot as a parent. And that skill will serve you as your kid grows, much more than just having someone tell you the "answer" would.
All that being said, if you're feeling overwhelmed, and your self esteem is dropping (as it sounds like it might be, you're being super hard on yourself!!), calling in some extra hands is a great idea. A parent, a friend who is a parent, a night nurse for a day or two - if you've got resources, use them. There's nothing wrong with saying "I need help."
I recognize that my last two points are in direct opposition to each other. Welcome to parenting!