Peter tells us to 1. be aware that the devil does exist and is dangerous and cunning. 2. Be disciplined in our faith 3. Resist the devil at all times 4. Be alert so that you can recognise the devil's wiles 5. Remember that Satan can be overcome, he is not invincible. 6. As a Christian be prepared to suffer persecution,yet be victorious through faith and prayer.
Extra: The instructions are similar yet different from Paul's. Paul also tells us that our enemy is not flesh and blood and we must be aware of him. Further he gives us specific tools with which to arm and gird ourselves -- the helmet of salvation through Jesus Christ, the belt of Truth, abide in Jesus, He is the Truth; the shoes of the Gospel of Peace, the Goodnews of Christ that brings peace; the shield of faith, our belief in Jesus to which we must be steadfast; the sword, the word of God which can destroy the enemy and which we must use at all times as we remain in constant prayer. Paul tells us in a more straight forward way what must be done to overcome the enemy whom we must face because there is no covering for our back. We cannot turn and run; satan is to be faced and defeated.