Steve,
I believe sanding the plating down just has to be done, but it is of course at the whim of the individual model builder.
As Phil said above, the sanding is a tedious process and it isn't what many modelers want to do first thing after opening the kit box.
I broke up the sanding time up by doing work on the island, doing assembly on the cranes, guns and started on some aircraft. It helped.
Having the sub assemblies done is paying off now.
Enjoy your build.