"Try" is self-denigrating. It essentially means that you are not capable of doing a certain task - or at the very least lack the necessary self-confidence to do it. It implies you are not sure if you can do it.
By eliminating the word try, you make up your mind to either do something or not. You will either ignore the task completely or do whatever is necessary to complete the task. It implies that you will have the necessary perseverance in the face of any obstacles that may emerge.
By eliminating the word try, you are declaring that you are capable of doing the task and that you have the self-confidence to fight whatever might stop you from completing it.
