How do I find a reliable Chinese supplier to manufacture electronic circuits for my product?

I have designed a prototype of my idea which includes simple electronic circuits. I would like to manufacture it in China. (yes ... because of the money)

I would like to know how it is to find a reliable Chinese supplier.
I need to know where to look for, how to make deals, should I do it personally or get a supply manager as a consultant to do it for me.

I am in the process of starting a business in Sweden, and this is my first time doing it.

I appreciate all the useful answers,

Thanks :)

I'd recommend looking for contacts on http://www.alibaba.com/ Users have feedback/reputation levels you can base your decisions on - and you can check with third parties to verify the credibility of any particular supplier.

Perhaps the best way is to travel to China and meet with the factory owners. This is the approach that Bunnie Huang took when looking for suppliers for his startup: Chumby.