DON’T LET THEM SEE YOU SWEAT.
Take pointers from Richard Branson, he’s always seen as having fun. You never see him doing paperwork or sitting at his desk. To be as successful as he is, he definitely is doing just that, but we just don’t see it.
This is the image you want to cultivate – suave, easy, relaxed, in control. You never run, panic, never seem to be in a hurry. You may stay up late, work holidays/weekends to get the job done, but never admit it (unless you need to). Don’t moan about how hard you work or the hours you put in.
To be able to accomplish this, you need to be very good at your job. What if you’re not? Learn, study, ask questions, read, cram, do what it takes. However, don’t overload yourself, look for ways to ease your workload in a professional manner.