Basically. You're not agreeing with them, you're just reiterating whatever they're feeling. Read up on Wonka's cheat sheet - it has some great gems. Sometimes they won't say what they're feeling, but you can tell they're angry, frustrated, sad etc. Just take a good guess and if they're not feeling that way, they'll tell you.
It's way easier to do it over text than in their face - i've tripped up a couplea times in the beginning when it was face-to-face, but I've become better. I read the cheat sheet every few days to remind myself.