Hi - Megan is it? First of all, you've come to the right place... valve replacement is what we're all about (and some other stuff as well). My first suggestion is to take a deep breath and try to relax a bit. The diagnosis of surgery is a bit overwhelming and you're are understandably anxious.
Yes, the surgery is quite common and the mortality rate is very low. It is major surgery, though, and there are certainly risks and bumps along the way.
Since you're here, you've probably noticed that there are a number of avenues you should explore. It helps to read a number of the threads, from valve selection to the pre & post surgery areas. The "stickies" in the various forums are a tremendous help... lots of common issues that people have encountered.
Don't hesitate to ask questions - there's a wealth of info - real people telling it like it is. We're all different and so are our experiences. Your husband is young and will, most likely, bounce back fairly quickly.
My own experience was not too bad - though I wouldn't have said that at the time! I was in the hospital from Monday (surgery day) until Saturday. I had a bit of trouble the next day with rapid heart rate (not uncommon - as the heart is trying to figure out what to do next) and wound up back in the hospital until they got everything straightened out. Once I finally got back home for good I was able to work from home for a about 3-4 weeks and then went back to work part time for a few more weeks before diving in full time.
Cardiac rehab was very helpful and I highly recommend it. My surgery was on May 16 and I started rehab on June 8. I was back on the golf course that summer - a bit tentative in my performance but I was out there.
I would encourage your husband to jump in here too ... he would probably benefit greatly by asking his questions and addressing his fears and concerns.
So, welcome - sorry you're having to face this - but you're not alone.