A cow milker is no where near the size that you would need to express from your breast. Plus the suction would be extremely painful. I hope you wouldn't actually try this. Use a medical breast pump, it is free through insurance if you are in the USA. I have the medela pump in style. Works great.

What did i just read??? LolAnd I used an avent one that worked great 

Really??

Medela electric pump is amazing