If you are planning to install one of my camera kits then you probably have tools that will do the job. However, rather than making do, I have put together an installation kit to make life easier.
I have put the following kit together which includes some good quality trim tools, a nylon puller, insulation tape and some cable ties (I am working on the basis that everyone would own a screwdriver!) - everything you need to install the reverse camera kit:
From experience then I would say you definitely need something like the nylon puller to feed the cable through a 370Z Roadster. Also, if you have a GT-R then it is again essential to feed the wire through your rear bumper (and the trim tools mean you don't run the risk of scratching your interior).
The cost is just £20 when ordering a kit, or £25 if ordered separately