Oracle export and import

I have an Oracle database configured with WE8ISO8859P1 character set (call it DB1). The database needs to be updated to character set WE8MSWIN1252. I need to preserve the DB1 database, so I've created a new database with WE8MSWIN1252 (call it DB2). I would like someone to do this for me:
1. Export entire DB1 including data
2. Import the DB1 export into DB2
Communication and control will be done with Zoom