Resist the devil and he will flee. Do not fear the devil because the Bible never instructed you to fear the devil, rather fear God and resist the devil.
Keep on celebrating Christ and rejoice in the Lord always. Put on the complete armor of God and pray without ceasing. Thank God in all circumstances and crucify your flesh by the Holy Spirit. Focus on God and constantly magnify Him and His ability to heal, restore, renew, replenish, revive, rejuvenate, revitalize and deliver. See the greatness of God and the littleness of your problem.
Flee every appearance of evil and always keep your hands clean. Be as wise as a serpent and as innocent as a dove.
These are the practical way of resisting the devil.