I'm sure you can read books, listen to podcasts, and find online resources to learn basic principles and guide your learning, but I'd highly recommend hiring a sales coach / guru.
I struggled w/ sales for ~8 months and then (very randomly) was introduced to someone who had 12+ years of sales experience in tech. I asked if I could pay him to sit down w/ me for a couple of hours and walk through all of my sales emails and correspondences. It was SO illuminating. I've continued to pay him a generous hourly rate to keep coaching me on sales, and ~6 months later, I feel extremely confident as a technical founder who can also do sales.
Getting an expert to walk through your process w/ you is really important because there are so many nuances.
