I think the easiest thing to do is head for the engine management computer, called the ECU (electronic control unit), and put it into diagnostic mode. This will do some basic tests for you, so why not make use of it? This is quite simple to do. If you have Nissan's workshop manual, you'll also see the expression ECCS. This stands for Electronic Concentrated Control System and refers to the ECU plus all the sensors and actuators connected to it.

One important thing to remember about the ECU is that it can generally tell you if the inputs are functioning abnormally (engine temperature, air flow etc), but it can't tell you if its outputs are correctly actuating the target device ( boost control, emission gas reticulation solenoid etc).

The other thing to note is that the ECU only indicates a fault if it detects a voltage which is out of limits, not if its a wrong voltage. For example, the air flow meter normal output range is 0.8 to 1.6 volts. If the ECU detects 0 volts, it registers a fault condition. However, if the air flow meter is faulty and putting out a voltage in the range 0.8 to 1.6 volts, then obviously the ECU is not going to register a fault. 

Run the ECU diagnostics to determine what faults are being detected.  Click here for procedure, which also covers the removal of the ECU and its connector.

Note: at this point I actually left the ECU out so I could make voltage measurements at its connector. I've often run the car without bolting the ECU to the chassis without any problems. The ECU circuitry is connected to "ground" through the wiring harness and seems to run well without the "ground" circuit via its metal case.

Is everything OK, but your car is still hesitating? If so you need to carry on but from now you will need to have a volt meter which can also measure resistance (ohms), and current (amps). You can buy a cheap one at your local electronics store- Dick Smith etc. Shouldn't cost you more than around $20.

Note: if you are going to make measurements on the exhaust gas sensor you will need a analogue meter that has a FET (field effect transistor) input, or a good quality digital meter.