has anyone got remote harvesting working? i cant for the life of me figure out how to do it...

Once it says activating your good. It takes about 24h to actually start harvesting (wild guess: it's somehow connected to vesting but don't ask me the exact reason)
hang on.. do i not need to leave my computer running 24/7 if i want to harvest as much as possible..? i dont get how its remote if im not linking to any other nis or ncc??
Well you have to have a remote NIS to harvest remotely.
That's kinda the point of the excercise

(Besides the security aspect which is why it's also called secure harvesting)
If you have no remote NIS then you must harvest localy which would mean having NIS running as much as possible.
If you do have a remote NIS you merely have to activate remote harvesting and you don't need to have anything on localy.