Hated clarinet. Could not figure out how to get any sound out of it. I'm too petite for the bass. I have big hands, though, so I suspect I won't have trouble with the viola.
I was always fantastic at sight reading. My piano teacher used to laugh at me because I would sight read through what I didn't want to practice, and she could tell, but it was still good because I sight read well. Still do. Worked out well for being in chorus. And orchestra. When I was in middle school, we had an audition-only orchestra. I was the only person in it who was not taking private lessons, and I was a first violin my second year. Credit it to sight reading. Just learning the new clef will be a challenge.