How is NSe's circular on "self Trade" going to affect us, if at all?

Its beneficial in the sense that all such orders where the buyer and the seller are the same persons will get canceled.

Think of it: What purpose does it trade if you’re selling a contract to yourself? Nothing. Add to it, you’ve to bear the cost of execution of such trades - Brokerage, STT, Stamp Charges, Turnover charges etc.

So the Exchange is facilitating avoiding such trades which in turn helps on unnecessary saving trading costs.