It is very important to protect ourselves from Shaytan. There are verses in the Quran that are so powerful they can protect us from the Devil. The verse 255 in Surah Al-Baqarah is extremely powerful indeed.
This surah mentions the greatness of Allah and the fact that He is in control. Allah is the Protector, He has the knowledge of absolutely everything. We are taught that if we repeat this verse we will be protected from Shaytan.
Read ayatul Kursi in the morning thrice and read ayatul Kursi in the evening after salatul Maghrib thrice. Try and read it once after every salah. This is the way to protect ourselves from the devil, from the evil eye and other things that we cannot see.
To add to that the last two Surahs of the Quran known as Al-Falaq and Al-Nas. We should learn them and their meanings and read them and repeat them.