Admission tickets cost 1,000 pesetas and only 8,600 are available each day. These can be obtained from any branch of the BBV Bank in Spain, or from the branch in Granada. It's worth doing this as it's a long walk up the hill to find all the tickets have been sold. Admission to part of the palace is by a timed entry, clearly marked on the ticket. Details of admissions, opening hours, etc can be obtained from the Alhambra web site .
Parking is a nightmare in Granada - as in most Spanish cities.
I parked in one of the underground car parks in the Puerto Real in the centre of the city. It's only a few minutes from the Cathedral and the BBV Bank for tickets for the Alhambra. There was so much to see in Seville and explore that I have to return at some point soon. Parking again was a nightmare, but I found space in the underground car park behind the Bull Ring, under the produce market. Seville was the setting for Bizet's opera, Carmen.