  This tutorial presents the most important aspects of the molecular
self-probing paradigm, which views the process of high harmonic generation as
"a molecule being probed by one of its own electrons". Since the properties of
the electron wavepacket acting as a probe allow a combination of attosecond and
\AA ngstr\"om resolutions in measurements, this idea bears great potential for
the observation, and possibly control, of ultrafast quantum dynamics in
molecules at the electronic level. Theoretical as well as experimental methods
and concepts at the basis of self-probing measurements are introduced. Many of
these are discussed on the example of molecular orbital tomography.
