My 10month old baby will comfort herself to sleep by sucking on the back of her left hand. If i push her hand away, she will wake up / gets angry and all effort to make her sleep will have to restart all over again. How to get her to stop this habit of sucking her hand to sleep?

All you can do is to keep removing, otherwise give her an alternative like a pacifier or teething blankie. At 10months old, that is her way of self soothe. Ill take it positively though. Many other parents are struggling to teach their bubs to self soothe. Maybe you want to let this slide. Just my thoughts.