Event planning is stressful...period. If you are not one to deal with stress very well you might want to reconsider what you are about to undertake. These are not words to put you off, rather words of experience having been through the trenches.
I have added this to the checklist because out of all the other event planning checklists I have researched, not one mentions anything about it. So...relax...breathe...and check that one off the list.