[gtallen1187]

Here are some things I've found helpful:

1. Most importantly, set your own expectations correctly.

No matter how you slice it, switching domains after years of experience is going to be tough. That's not to say it isn't the right decision, or won't be incredibly rewarding. It's just going to be challenging. I've had more personal success in these scenarios after accepting that fact, and not being so hard on myself for the ramp-up time.

2. Identify people with expertise, and talk to them.

Don't get stuck in a research/reading rabbit hole. It can be tempting to sit back and try to replicate your prior expertise by reading/studying your new domain. Rather, find people you identify as experts and talk to them. Learn from their experience. Chances are it is your experience that made you an expert in your last domain, so do your best to learn from those with experience in your new domain.

I hope this helps!