The job is no picnic. Also, it's a bit more stressful than packing for a picnic. Some days may be smooth sailing, but a storm is always on the horizon. On a day-to-day basis, caterers feel about a 2 out of 10 on the stress-o-meter. Once the weekend party frenzy hits, caterers may be riding out a level 10.
To remain productive and pleasant around clients, caterers must handle their stress. Try serving a platter of appetizers to guests in a yoga pose. Don't try downward dog; the probability of spillage is too high.
Those with anger problems need not apply. Your staff will hate you and you'll lose business if you sweat the small stuff. Just sweat the big stuff.