Assalam oalaikum,
When you sit down to do the amal recite Surah al-Hamd, Ayatal kursi and the 4 Quls thrice and then blow over your finger. Then make a complete circle around yourself with your finger. Remember that there should not be any gap in the circle otherwise the jinnat can intrude into the hissar and harm you.
Similarly a hissar is necessary before a haziraat amal also but with a slight change. Recite Ayatal kursi and the 4 Quls. After this read this dua. Then blow over your body. Then repeat the duas
آمَنَ الرَّسُولُ بِمَا أُنزِلَ إِلَيْهِ مِن رَّبِّهِ وَالْمُؤْمِنُونَ ۚ كُلٌّ آمَنَ بِاللَّهِ وَمَلَائِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ لَا نُفَرِّقُ بَيْنَ أَحَدٍ مِّن رُّسُلِهِ ۚ وَقَالُوا سَمِعْنَا وَأَطَعْنَا ۖ غُفْرَانَكَ رَبَّنَا وَإِلَيْكَ الْمَصِيرُ
and make a hissar or protective circle around yourself.
The amal for bringing moakkils under control the amil needs a strong protection. So the hissar is indispensable as it protects the amil from jinnat attacks. Before doing any amal recite the above mentioned dua thrice and then blow over yourself and then repeat the dua and then blow over a knife or your finger and then draw a hissar or an imaginary circle around yourself, leaving no gaps in-between.
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