I would also recommend dutch word of the day. My Dutch isn't good enough to remember most of what he posts. But he does post an audio file for most words/phrases, so I use that to get used to hearing and repeating dutch. http://www.dwotd.nl/
For me the hardest are the vowels, but especially the "g/ch", "eu", "ui", and little on the "a/aa". (I think UK english may have an edge on the "a/aa" ... almost every dutch guide I read says "a" is pronounced like "bath", which only makes sense, I think, in the UK accent. The U.S. pronunciation for bath is closer to "aa" in Dutch.)
The consonants are mostly pretty close to English. Not that you should ever stop practicing the Dutch pronunciation, but if you slip into an English pronunciation, I think you'll still be understood. They'll just know you're an English speaker
I myself am still learning. I can utter a few sentences and know a basic vocabulary. I was told by one of my co-workers in Holland that I have a slightly German accent in my dutch, which is funny since I don't know a word of German!