I'll add: a 20a circuit requires 12g wire, not 14g which is used for 15a circuits.
I'll second that, at least AWG 12. Since our cars cannot accept anything higher than 3.3 kW, that translates into a 16 amp draw at 220 VAC. 20 amp capacity is the minimum for not only safety, but for satisfying code requirements.
Also note that these lower powered chargers, or more correctly electric vehicle supply equipment (EVSE), since the charger itself is contained in the car, come with a variety of different plugs, so make sure you install the correct outlet. The EVSE linked above uses a NEMA 6-20p plug, which appears to be the most common. That's what the EVSE I ordered uses as well. But there are others, so you might wait to install a plug until you at least identify the equipment you're going to buy.
Finally, if you have the least doubt about your ability to work within a live, powered circuit breaker box, please don't
! Pay an electrician to do the work and stay safe. Touch the wrong place in that box and you could receive a lethal shock.