Josse studied drama at the Koninlijk Conservatorium in Brussels, Belgium. He had some famous teachers, such as Nand Buyl and Leo Dewals. People like Luk De Konink, Jaak Van Assche, Tessy Moerenhout, Luk van Mello, Gilda De Bal, Luc Springuel, Magda De Winter, Chris Cauwenbergs, Tuur De Weert and René Verreth were his co-students.