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On a two-lane street this won't be an issue. But if there is more than one lane of traffic going in the same direction, merge into the left lane. This will signal to other drivers that you are about to enter the center turn lane. Remember: the center turn lane is used by traffic going in both directions. You need to look for oncoming cars as well as cars going in your direction. When you see that the coast is clear, decelerate and ease your car into the center turn lane. Unless there is no traffic coming in the opposite direction, you'll have to stop before you make your left turn. Wait until there is a gap in the traffic before you attempt your turn. Also watch out for traffic pulling onto the main road from side roads. Accelerate at a normal pace. Once you begin the turn you will be in a lane of oncoming traffic, so don't stop once you've started your turn.
Get in the left lane. Turn on your left blinker. Watch for other traffic in the center turn lane. Pull into the center turn lane. Look for oncoming traffic in the left lane. Make your left turn.