All great advice here. One other thing to consider is if the roles were reversed. What if you were still in your old field and a new senior member joined your t

All great advice here. One other thing to consider is if the roles were reversed. What if you were still in your old field and a new senior member joined your team? She has 12 years of experience, but not in the field. What would be your expectations of her? You'd likely expect that it's normal for her to take time to gain a bunch of context about the area. I promise you your coworkers feel the same way about you now. Take the time to ramp up. No one is expecting gigantic impact from a senior person in their first three months. Good luck.