Please don't get depressed with stroppy colonies. You have several choices.
Get dressed in bomb proof gear and go for it. Two layers of everything!
Put up with the stings. Why?
Leave them alone for a few weeks to calm down. Only go in if absolutely necessary, after all if they swarm and you lose half your hive you will be dealing with less bees and hope for a queen with a better temper. It probably won't come to this as bees have bad days the same as us and can change temperament overnight.
You can consider requeening
As the worst scenario you can dispose of the whole hive
I have a hive that can be as nice as pie or sheer hell. I never know until I remove the roof!!
My biggest tip is not to keep opening your bees unless you are doing so for a purpose, only open them until you have achieved that purpose. Wait for the right conditions and when your bees are flying well.
If they are bored or fed up they will take it out on you!!
Most of all keep smiling. It helps to have an experienced keeper with you if you are getting nervous and losing confidence.
Keep smiling
E