Kingdom of Spain
Spain is a second home for many foreigners. A lot of people from northern EU countries choose the spanish coastline to enjoy the good weather and food. However some administrative procedures in Spain might be quite different and difficult if you are coming from a country like Germany -- accomplishing a simple task with the spanish authorities could look to you like a mission impossible.
However most of the administrative processes are quite well described on the relevant sites of the government agencies, but if you are not fluent in Spanish your might not be able to understand everything.
First thing to keep in mind is, that while in Spain you must speak spanish. Do not rely on the fact that you can go ahead with english - spanish people love their language, and they would expect that you speak it, or at least try to speak it. Even with the worst spanish you can accomplish much more that with the best english.