Dick,
The wooden trim is held up by small nails, about the size of picture hanging nails. The trim must come down to remove the lower fan plate containing the switches and thermostat. You can remove the trim by pulling down on the moldings around the edge with your fingers. You need pretty strong fingers, but it is doable by the vast majority of men. The wood panels between the lower trim and the fan will then come down easily as well as the spacers that are used to adjust the spacing on these panels. After the wood is removed, the fan plate is easy to remove.
Gerald