I just exercised the options given to me when I joined my company.
Initially, I tried to exercise with what is known as a limit order (which means, only sell if the price is higher or equal to the limit price), however, the price drop further, so I cancelled the order and changed it to a market order (which means, sell at whatever price people are willing to buy at).
I'm not the least bit concerned about sending the money wrongly to another account.
Instead of using DBSSSGSG, I'm using DBSSSGSGXXX. I didn't prefix the account number with 7171 081 which is the bank code and branch code for POSB.
This won't be the largest amount of money ever to be transferred into my account as 6 years ago, when I sold off the piece of land in Calgary, that was the largest amount of money ever to be credited into my account. I guess this could be considered the second largest.