What makes the managerial task of executing strategy so challenging and demanding is the

time and effort it takes to build core competencies.

people$-$management skills required, the resistance to change that has to be overcome, and the perseverance necessary to get a variety of initiatives launched and kept moving along.

time, training, and creative effort it takes to empower employees and teach them responsible decision making.

supervisory requirements associated with getting company personnel to do things the right way.

trial$-$and$-$error experimentation that is required to come up with a workable organizational structure.