Hello

I live on a finca with terraces. It has been untouched for a long time and now lots of pine trees have taken over the higher terraces.

What are the rules about cutting these trees?
I don't want to cut the big ones as they are out of the way.
It's more the young ones blocking access.
Should there be a fire break between them ?
If I'm not allowed what about cutting branches?
Who do I speak to about getting permission?

Thanks so much