Actually, anonymous, you are a Hong Kong person, and I advise you to waste no more of your time trying to learn Received Pronunciation. If your own accent is understandable to those with whom you communicate, just continue to be yourself. By attempting an accent which doesn't come naturally to you, you are in danger of sounding pretentious or ridiculous.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.