Denial is powerful medicine. First off, denying Lucifer power over you is a good start. Not that we need to discuss the true nature of Lucifer, but rather deny him power of you.
The good ole Jesus technique, "Satan, Get behind me" is a great step in claiming your power. Believing you have the power to protect your energy field is the ultimate technique of actually doing it. And basically, a defiant attitude against those that seek to influence and rule over you is the best protection.
This can start out as anger, even rage filled spells of defiance and "back off" might be necessary to start. But a master can stand in the presence of malice and hate with a quiet and gentle, "you cannot touch me" and be just fine.