 Unpopular truth. Demons can tempt you, but you choose to sin. The Bible says that we're tempted when we're drawn away by our own lust. You have two enemies, self and Satan. Some are so earthly minded that they deny the existence of demons and remain wide open to demonic attack. And some are so focused on demons that they blame all their problems on them. Their problem isn't demon oppression, but demon obsession. Some think everything is a demon. Some think nothing is a demon. Both extremes leave you in bondage. You need to address both enemies. Deliverance from demonic influence comes by resisting the enemy with God's word and rebuking him with Christ's authority. Once you've dealt with the demons, recognize that you can't cast you out of you. So discipline of self comes when you surrender to the Holy Spirit through prayer and obedience. Deal with Satan and self. You need both. Deliverance and then discipline.