Whatever you thought you learned from wikipedia, forget it. The trick is not to use GM graft commercial varieties from ordinary grocery supply chains. If possible, get a graft from a mature noncommercial tree because it will produce fruit much faster than waiting 7 years or so to get fruit starting from a pit. Commercial pits can grow into trees, but their yields are bad because of evolutionary and GM pressures. As an experiment for kids, growing commercial pits
is fine but it will be more of a decorative and science project than a microfarming hack.