how to perform sajdah Sahw step by step

Soon after finishing the prayer, niyyah should be done as follows: " I do sajdah al-sahw in lieu of tashahhud (or salaam or sajdah or qiyam etc.. as the case may be) wajib qurbatan ilal-Laah." Then sajdah should be done. In Sajdah you have to say once "Bismillahi wa billahi Assalaamu alayka ayyuhan-Nabiyyu wa rahrnatullahi wa barakatuh." Then raise your head; sit properly; go to sajdah for the second time; recite the above-mentioned dhikr once; sit down properly; read tashahhud and salaam.