How are your plans coming along? As an American expat in Berlin, I can attest that it is possible.

The expat guide is a great place to start, and I would also really recommend checking out expat blogs in Germany. There is a really strong expat community here with great information. I offer wandering advice/experiences on living in Berlin on my blog, Back to Berlin, but I would advise you to check out Travels of Adam's site & post on obtaining the artist visa.

Hope your plans are going well! Let us know if you have more questions.