I have no pictures. Last time I did was back in early 1980's although I did quite a few and did it as an experiment. Key was to trim close enough so primaries protruded at most 2" from feather base where attached to rest of wing. Two wings worked better than one. The doing one wing to imbalance flight does not work when birds employ clambering where flapping action helps bird run up a vertical surface. Two wings trimmed close stop clambering. Cutting secondaries can provide a little additional benefit although you also degrade protection from elements that secondaries would also still provide. Trimming if done now in northern hemisphere will need to be repeated come fall.
Dog needs a little training.
Dog needs a little training.