This is one practice that you may wish to discuss with your doctor or some type of health profession.I am no way able to give any health safety information.I am not taking any responsibilities of the use of this devotional practice.
I begin with fasting from food while drinking fasting tea.I purchase this premade tea and flavor it with honey.I would advise beginners to begin with skipping one meal and slowly working up to being able to fast longer.I usually do a three day fast.
During this three day fast,I either strike with the my riding crop or flog while reciting prayers of dedication to Satan.I will usually kneel as well.The satanic rosary is good hear as well.
You can also do self bondage techniques as well.I want my devotion to be uncomfortable to show my willingness to suffer in his name and my dedication to him.
For some,Satan is not a true entity but rather the satanic aspects of the self.I see it as being both to a degree.I am focused on self apotheosis ,so for me I am willing to accept the suffering to bring power to my self deified self.
I also love the idea of the satanic nun or priest take on it here as well.