Be clear of the amount of work that is needed to be done and the effort that you are willing to put in. A mismatch of these two factors is a critical factor of many who do not achieve the success that they desire. Do not say that it is too complex or impossible when you have failed to achieve it. It is ok to admit that you are not willing to put in the amount of effort needed to achieve the said goal. It simply means that there are other things that you value more in life. Often times, great wealth or better positions in life require a lot of effort and it is okay if you are not willing to put in the amount that is required. However, if you want to achieve the success that you desire, be clear on what needs to be done and be willing and prepared to do them.