For normal battery use you can expect 3-5 hours screen on time, tweaking kernel etc varies depending on what you use your note for.
Debloat and uninstall apps you don't use, turn off NFC/Location etc. That's about it really.
The people of XDA, including the Devs. Do not have to help you. We all choose to help. Everyone also starts somewhere.
City I live in makes and invented the Kitkat... I run Kitkat on my device. Aww how cute.