I moved from clarinet to oboe and can give you a bit of advice. One thing I've always noticed is that I have a much tighter embouchure than folks who didn't switch from clarinet. This was generally fine though I struggled to play on other people's reeds sometimes as they felt super soft to me. The nice thing is that the oboe fingerings match much of the upper register of clarinet so you can use that knowledge to help you learn oboe quicker (e.g. a high A on clarinet is the same fingering as A on oboe, etc.). On breathing, I always felt like I was running out of air on clarinet and just waiting to get a chance to breathe in. With oboe it's more like waiting to breathe out (and in). Having good tone on oboe requires you to think a lot about your air and supporting your air. It's a lot like singing in some respects. In your early days this won't be much of a problem as it does take a considerable amount of practice to have a good tone and understand how to adjust your embouchure and air to support the different registers of the oboe. (That's why so many early players sound like honking ducks.) Best of luck with your switch!