Decide where the fly will land, where it will sink and which way you will bring it back. The plate shows an outside-edge presentation: the fly falls beside a branch, then moves away through clear water. The line does not cross the trunk.
Land close enough to work the cover without deliberately throwing over it. Let the fly fall while taking up spare line gently. Watch the leader during that first descent. A stop or change of direction deserves attention; the retrieve has already begun even though you have not made the first strip.
Use a short pull to move the fly, then let its materials work during the pause. Adjust the sink to the branch you are fishing. If the fly is already below an obstruction, a longer pause may put it in the wrong place rather than make the cast more convincing.
Keep the rod directed along the line until there is weight to respond to. Make a firm strip to establish contact, then use the rod to guide the fish towards the open water you planned for. The point of choosing the angle first is that you are not inventing an exit after the take.
Fish another edge with a deliberate change of angle or depth. Repeating an identical cast into the same fork mostly tells you how well the hook holds timber.