I’ve always heard the ideal is about a 20% raise from your previous position, especially if you have plenty of experience with the new position.
Though this does depend on many other factors, I’d definitely try to get an idea of the standard salary for this position through any means, even a site like Glassdoor or something. Knowledge is power, especially when negotiating a salary!
I second this. Getting a source of external motivation like a coach is great for achieving a goal like this. Especially as they would no doubt have techniques to make the journey easier.