Pedestal bathroom sinks - double handed assembly makes sense
Pedestal bathroom sinks have the great advantage of disguising the pipe work and providing stability to the basin. Fitting a pedestal bathroom sink is so much easier if you have a helper. To accurately position the fixing holes you will have to balance the sink on the pedestal, make sure it is level side-to-side and fore-and-aft then mark the wall through the fixing holes which are under the basin. Unless you are a very skilled octopus, having an extra pair of hands will make this task much simpler.
Also when it comes to attaching the hot and cold feed and the waste pipe you will be working with the basin and pedestal unfixed, so, for safety reasons if nothing else, have someone supporting the porcelain parts while you work on the metalwork. Once everything is connected you can both shuffle the assembly against the wall and make the final fixings.