Sorry to say
but spain is a tough nut to crack, high unemployment so the locals won,t hire getting authorised is nightmare, check my other posts.
I was a service tec came here for the same reasons 5 years ago and only just got certed this year.
You need a good grasp of spanish and getting into wholesalers can be a nightmare. Might be different on the mainland but in the Balearics its hell.
I'm totally legal but a friendly local has told me I'll be denounced sooner or later just to give me grief.
However I didn't do too bad working under the radar just updating sockets and fuse boards and anything else that wouldn't likely cause anybody to go looking.
Hope this helps and doesn't totally put you off
The life out here is definately less stressful and warmer.
Cheers