MySQL DB to PostgresSQL DB

This is my first post and I will try to be short and clear in my questions and I hope you can help me with that.

I have a MySQL DB and I want to export to PostgreSQL DB.

My questions are;

- Is posible to export MySQL DB to PostgreSQL DB?
- Does PostgreSQL DB has tools to import MySQL DB?
- If is posible, How do I need to build the DB in MySQL?, in order to have success in the exportation.
- Do someone did it before?, exporting MySQL DB to PostgreSQL DB?
- What kind of risk do we can to have in this process?
- How long can take this process?

Thanks in advance.

Jose