Does anyone know whether it is straightforward to change the gearbox oil on the Charade 2003 1.0 EL? I have done some basic maintenance such as engine oil changes in the past, but am interested to know whether changing the gearbox oil is DIYable. Thanks!

p.s. if anyone knows how to get hold of a Haynes manual for the Charade 2003 1.0 EL that would be very helpful too!!