GeckoZ said:yes i do know the basics. what i'm asking instead was, how do you gauge the aperture and shutter speed acurately so that a picture would turn out perfectly as to what you intended. missing a stop would cause great difference, isn't it?
experience is the best teacher.
alot of trial and error is involved.. that's why there's exposure bracketing.. for tricky lighting situations.
actually if you know the basics as you claim, you really shouldn't be asking this question.
it really depends. a stop can make a difference depending on the type of medium you are shooting with.. so again , please do your research and read up on exposure latitude.
no such thing as getting it right the first time in photography.. and do consider about getting a manual film camera like mattlock suggested.