Thats one heck of a climb, you will need lots of time and commitment, start slowly and build up the kms as you get fitter.
I have been riding the hills around La Muela and Ronda, Andalucia, not easy, but I have only been back in the saddle for 7 months, I ride 3 - 4 times a week, Road and MTB, averaging around 70 - 80 Km each ride.