I've never used lube and they come out pretty good. Let me give you a few tips that i learned the hard way. First, use gloves and protective clothing (shorts don't work well, ask me how I know haha).
Make sure your mold is hot. I hold mine over a propane torch for about 20 seconds which seems to work well. If the mold is too cold you will not get very good ball castings. Same if true if it is too hot. It just takes a little practice and a little patience. Use a dowel or something to knock it open and drop them onto a towel or even a bucket of water.
Be safe and have fun.
There is no such thing as a stupid question, only stupid people.