Never will one ever be in a situation totally devoid of stress or tension. To ever reach such a state is to expect to find a turtle with a mustache, which does not exist.
You cannot guage the load. That depends on the situation. Decreases sometimes. Increases sometimes. But always unknown - always unpredictable.
One therefore needs to build one's ability to carry the load one faces or the stress you get suddenly will make you behave erratically and in an unacceptable manner. That will be the clarion call of your failure and fall.