Schwarzeneger's name is pronounced wrong as well, since the w should be pronounced like a v, the e after the n should be pronounced like a hard a, and the er should be pronounced like eh, with a slight r sound at the end.
Oh and the ch in german really depends on where in germany, switzerland, or austria you are, but it is indeed a unique sound (when english is your first language) if pronounced as it would be in, say, berlin.
I just came up with a way to explain the sound, pretend like you are imitating a cat hissing, soften it up a bit and that is about the sound you are looking for.