To have a success in life it just takes willpower?

If there's a will there is a way

Well Yes Will Power Is Important but so is effort, aim and drive to make yourself more successful even if you reach your dream don't stop there dream higher and learn to manage your priorities and differentiate personal llife from your work life, so along with Will Power make sure you work hard as well 

where there is a will there is a way i agree.

 Yes , If you want to do some thing you can do it .

but if you think I can do it or I can't , mostly you will not do it 

simply If you want you can

that's true .but willpower must be completed whith good luck and opportuneness.

95% hardwork and5% luck

Also depends how you measure success? A task not completed but every possible effort put in could also be satisfying for many as many a times success could also depend on external factors beyond our control

As a start I belive you are refering to power of will, willpower is usually attributed to the thrive to become more powerful, while power of will is what we use when refering to "determination and presistance".Anyhow, power of will is not sufficient to success, many other important factors play intercorrelated roles. For example intelegence, ones intellegence may play a positive or a negative role in the process of success, add to that accumulated intellegence, when10 people work on a project they are more likely to succeed than5 people. Another factor is risk management, bad risk managemnet could lead to quick failure! And lets not forget luck, and when i say i luck i don't mean paranormal activities that influence your success, but i mean timing, universal variables, butterfly effect (all the laws tht we cannort caculate) and belive it or not it will end up suming more than85% of the entire process (if we're talking about business or personal success).At the end of the day, your question is quiet philosophical/modern scientific, and is usually refered to as predeterminism vs free will conflict. for more information about it:http://www.informationphilosopher.com/freedom/problem/