There have been plenty over the years who have transitioned from FJ land into a multicrew environment, it all from my experience depends on your attitude and willingness to accept a completely different way of doing things.
The guys I know who adapted where the fellas who could see the bigger picture and who understood the difference between being mission orientated and being commercially orientated.
If I could give one salient piece of advice, understand that being a good FJ pilot and squadron mate is a different skill and mindset to being in a commercial multipilot operation. As my TR instructor said to me when I left the mob many moons ago "2 ears and one gobb shag...2 ears and one gobb"
Goodluck...its fun to stand up to take a pee!