Although we are a few years from FIRE, we have experience with each of us being in/out of the workforce - out of the last 60 months, only one of us was working for ~26 months, we were both working ~34 months. DW is in an industry that she is passionate about. I am not. She will be the FI and I will be the RE of our FIRE.
She has been forced to tromp around the country due to my military obligations, which has stressed us out but tightened up our strategies. Our key has been open and honest communication, with scheduled check-ins. The schedule takes the pressure off of the person that is "more curious" about the other's goals and it gives you some communication muscularity. Weekly, we will discuss successes from the previous week, goals and roadblocks for the next week/month/quarter/year, and anything we can do to assist the other's goals. When I was not working, my goals were often "I don't want to do anything this week. I just want to do deadlifts. And maybe I'll send out some resumes." (Down time is important.) DW knew my intentions and could participate and vicariously experience my "nothing." Sometimes we disagree on the course of action, but it is better to disagree than to let bad feelings fester. Everyone fears and is hostile toward that which they can't understand!
As we approach FIRE, during which I intend to RE while she continues to be "selfishly employed" (Jeff Yeager - How to Retire the Cheapskate Way), communication of our goals is becoming more and more important. She knows that I am interested in at least 3 months of trying to relax and redefine (unlikely to occur b/c I am a spring-butt) and that there is potential for lone travel. I know that she plans to go where her work takes her and that I will need to support the logistics of moving. Even though our income plans are different, our life together is still the same.
Best of luck to you! Great question and I look forward to reading more responses.