The vet should give you a post-op caresheet about what to do. Usually you just need to keep them from chewing on their stitches or from being so active that they pop the stitches. Also keep them clean and dry, so no outside time or baths for about 10 days. Also how to spot the signs of infection, just in case. Other than those few things to look out for, usually 6-month-old kittens bounce right back!