Guillaume wuxuu waxbarashadiisa ka soo qaatay Lycée Robert-Schumann oo ku yaal Luxembourg; Collège Alpin International Beau Soleil iyo Institut Le Rosey oo ku yaal Switzerland; iyo Royal Military Academy Sandhurst, Camberley, England. Wuxuu bilaabay waxbarashadiisa tacliinta sare ee Boqortooyada Ingiriiska halkaas oo uu wax ku bartay Jaamacadda Jaamacadda, Durham iyo Jaamacadda Brunel, labadaba England.
Akadeemiyada Milatariga ee Boqortooyada ee Sandhurst