Yeah, we went through this too. I motivated for taking the routes that kept our options open - going to the interview, and then activating (which we took a few months to do), and then we still had another year after that to properly decide whether to make it permanent. My husband wasn’t sure about it at the interview, and he still wasn’t too sure about it after activating, but about 5 or 6 months later he made up his mind he did want to move. (I always wanted to. But yes it is scary.)
FYI we had made our activation trip what they call in our local forum an LSD trip - look, see, decide - not a vacation as such, but a few weeks spent staying in different cities we thought we might be interested in living in, finding out what we could about general living, jobs, etc in each of those places. It was very worthwhile for us to do that.