Peel and slice cucumber.
Apply a layer of cream cheese to all slices of bread. (Having cream cheese on each slice of bread helps to avoid the bread getting soggy from the cucumber.)
Put cucumbers on one slice of bread (for each sandwich). I usually do four slices per sandwich. You'll then put on piece of bread on top that has only cream cheese on it. (So, each sandwich has four cucumber slices, for example.)
Slice the sandwiches in triangles, because that's a rule with cucumber sandwiches, right?
Display on a pretty plate, and be prepared to have your friends ask if they need to hold up a pinkie finger while they eat.