  We have performed in-plane transport measurements on the two-dimensional
organic salt $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Cl. A variable (gas)
pressure technique allows for a detailed study of the changes in conductivity
through the insulator-to-metal transition. We identify four different transport
regimes as a function of pressure and temperature (corresponding to insulating,
semi-conducting, ''bad metal'', and strongly correlated Fermi liquid
behaviours). Marked hysteresis is found in the transition region, which
displays complex physics that we attribute to strong spatial inhomogeneities.
Away from the critical region, good agreement is found with a dynamical
mean-field calculation of transport properties using the numerical
renormalization group technique.
