I'd agree, 50 odd days in for me and vocabulary is fine but I come unstuck if I try and strike up a conversation!
50 days isn't enough (unless you're spending about five or six hours every day on it) You need to have a vocabulary of at least 750 words (and probably higher) to strike up a basic conversation. I've reached that at just over six months, doing roughly 90 minutes a day. I'm going to spend a bit more time yet before I sign up for a Skype exchange and have a real conversation - I'm aiming for 1,000 words.