Hi Dacia,
I had a "tutorial" before I gave birth, with a midwife who came to my home. She also lent me a tape (she's retired now)
You might want to contact Everdawn Midwives
http://www.geobaby.com/directory/hon...wives/details/
Mrs. Chee has excellent English (I think she worked in the UK for several years) and since she's also Chinese, she might also have contacts for confinement nannies.
You might also want to check if some of the Kln-side hospitals have prenatal classes in English - Maybe Queen Elizabeth or Prince of Wales?