You'll need a nylon/plastic hammer to strike the HINGE of the mold. NEVER strike the mold itself. Works better than a chunk of wood.
Minies tend to stick to the plug and sides more than balls, so a little force striking the hinge is needed. I fold a motel towel on the bench and drop the minies on it. The skirt is fragile when hot.
I cast for over 40 years, didn't wear glasses. Had a speck of molten lead land on my lower eyelid last year, scared the bejesus out of me. Now safety glasses are mandatory.
Be critical for quality control, or just plink with rejects. OTOH, If your buying metal you probably better recast them.
Btw, what are you casting for?