it's easy with a MM to test......next time it clicks test the power at the small wire on the solenoid.......someone needs to be turning the key to start.....if you get 12 volts then most likely it is the starter or solenoid.....if you get less than 12 volts it is , the NSS, ignition switch or one of those components.....if you play with the transmission shifter will it start?.how about if you fiddle with the key and the steering column will it start?.....you also can test the main cable at the starter that should always have 12.5 volts...