Left-handedness. Doing exercises

Have patience. As mentioned above, learning how to write with your left hand is a process that will take time and dedication. You will need to be patient with yourself and prevent yourself from giving up too easily.

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  Remember that it took you years to master writing with your right hand as a child and even though it shouldn't take you quite this long to write with your left (as some of the skills are transferable) the learning process will take time.
  
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  Don't worry about speed initially; just keep practicing with as much control and accuracy as you can, and you will become faster and more confident with time.
  
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  Keep reminding yourself of what an impressive and useful skill it will be when you can write with your left hand. Staying motivated is the biggest challenge you'll face as you work towards becoming left-handed.
  

Do everything with your left hand. Skill automatically transferred from your right hand to your left hand somewhat in all those previous years of your life, so it won't be extremely hard to start doing things with your left hand at first. Since skill also automatically transfers from one task to another task somewhat, you will gain the skill faster to do a specific task with your left hand if you do all tasks with your left hand than if you do just that task with your left hand. Be patient. Some people say the older you are, the harder it is to change to left-handedness but that's misleading. The illusion that changing handedness is easier at a younger age comes from the fact that the higher the skill you have with your right hand, the lower the patience you have for a given amount of skill in your left hand. In fact, the older you are, the shorter it takes for your left hand to gain a given absolute amount of skill. The easiest, but most important thing you can do to strengthen your left hand is to use it to complete all of the actions and activities you would normally do with your right hand.[6]

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  Make an effort to brush your teeth holding the toothbrush in your left hand. You can also comb your hair, pick up your coffee cup, butter your bread and open doors with your left hand, among many other daily activities.
  
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  Also try throwing darts (in a safe environment), playing pool, or throwing and catching a softball with your left hand
  
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  If you're finding it hard to remember, and keep using your right hand accidentally, try bandaging the fingers of your right hand together. This will prevent you from being able to use it and force you to use your left hand instead.