Holding your nerve at the death
Shane Watson, in an interview with Bharat Sundaresan for the Indian Express, discusses the challenges of the shortest format of the game, particularly the pressure bowlers face during the death.
If you get hit for a couple of boundaries in the first two balls, you are trying to do whatever you can and get done with your over without conceding too many more. The balls that you bowl then will certainly be slightly different from what your plan was originally. In T20 cricket, you are always trying to bowl the ball that the batsman isn't expecting. So, by getting those early boundaries he's ensuring that the bowler's scope is reduced drastically. As a bowler you need to focus on sticking to your guns without letting him decide the areas your are targeting. Yes, even if the first two balls travel to the fence or over it.