Don't whistle before you are out of the woods proverb
Don't conclude a problem solved until it is completely resolved.
"Your heart operation was successful. You are no longer in any danger" - "There might be some complications. Don't whistle before you are out of the woods".
"The problem will be solved if he agrees to help us." - "Don't whistle before you are out of the woods".
If you do something or something happens in a blaze of glory, you do it or it happens in an extraordinary and impressive manner.
The band intended to perform publicly and go out in a blaze of glory.