Believing in yourself is very important in enable you to achieve whatever you want to achieve no matter how difficult or hard it is.If you believe in yourself it means you have confident in what you are doing.
Upon all, what you want to achieve you should put God/Allah first in your plans and decision making, for you to make good decision .
Believe in yourself,have confident in yourself and pray to God/Allah to let you achieve your aims and dreams, surely you will achieve them