All of God's promises are available to anyone who believes, and God's answer is always yes. 2 Corinthians 1:20 tells us "For all the promises of God in Him (Christ) are yea, and in Him Amen, unto the glory of God by us."
In Mark 9:23, it is written "Jesus said unto him, If thou canst believe, all things are possible to him that believeth."
And in Mark 10:27 we see "And Jesus looking upon them saith, With men it is impossible, but not with God: for with God all things are possible."
God's Word can never fail. Hebrews 10:23 says "Let us hold fast the profession of our faith without wavering; (for He is faithful that promised;)" God will always come through for you!
Believing for your victory is just confidence that God will do as He has promised. Expect Him to do the impossible. Expect your circumstances to change for the better, no matter how bad they may look. God excels in making a way when there is no way. Choose to believe what God says about your circumstances, rather than what you can see in the natural. Other people can tell you what they see, but they are not the final authority. God's Word is the Final Authority. If you will stand on your promises for whatever your need is, and stand for as long as it takes, you will see an amazing victory!