Is there an easy way to remember which plate, glass, or fork to use?

Regarding formal dining and etiquitte:

When I am at a rectangular table, a quick glance to the end of the table helps me figure out which roll plate and glass is mine. But I can never remember the rules when I am at a round table. Usually no one can, and they all wait for the first person to start, and then follow his lead.

How can you help me remember?