I have been lurking around in the dark here hat ECF for a while. I have been smoke free for about a month now. Im slowly moving into the juice. I hear alot of talk about refilling and autos. My wife is never going to take to a manual. Currently all our 5 batts are autos. How important is a manual when refilling and other than being cautious not to overfill and clearing the tube/battery connection, what other cautions should be take?