If you are
buying in the UK and as you state, that you need to build up experience, I would suggest that the rias between Cap Finisterre and Vigo should be om your list of locations to build up experience prior to considering a lengthy
passage to the
Mediterranean.
The rias there, with many
marinas and
repair facilities are comparatively close to Viana de Castelo and an entire year there would be of benefit to allow
day sailing with multiple options and facilities as needed and be easier to access by road from your base in Viana de C,
The Atlantic coast of
Portugal is a lee shore and has very few locations accessible in bad
weather.
In the
Med, it can be problematic for a
single hander to
dock using the
Mediterranean mooring system.
Good luck and fair winds.