Amazon Overwhelming for new sellers

We are very close to launching our first products on Amazon. We are in the brand registry and have a branded store, and when you think you have one things susseed you realise you are at the bottom of the hill.
I don’t know if I am overthinking it or if it truly is like this. I am good with organic seo, I can build wordpress sites (using themes), I am a professional photographer and good with image ratios / saving but the amazon eco-system never ends.

Do most new sellers just accept they are going to make a million mistakes or what?

With a new product launch, what is the best practice? Obvioulsy optimise as best as possible but before you press “launch” are there any good practices? I was tolds by Amazon rep on chat that “honeymoon period” is not real and instead to look at the NPL - New product launch program… is this even a thing? Or do you just launch and hope your optimisation works and run some PPC?

What do you do after launch apart from praying?

Any tips for a new seller would be great.
Thanks.

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Can anyone shed some light on this???