Not much.. previously I used to trade big.. but now not more than 100 units.. However, If I'm not working for salary anymore, then I need to be more accurate and trade big as well... so sharing info that I have and getting info from the experts on this board as well 
Most of my trades are naked CE PE .. so got to be carefull.. but no more than 200 units in Banknifty
Most of my trades are naked CE PE .. so got to be carefull.. but no more than 200 units in Banknifty
For me Risking 50% of whole week profit on such trades can be a good idea. Though haven't tried.