Much of this movement is to regulate the contents of the cell. This includes bringing material into the cell from the extracellular environment or the plasma membrane (endocytosis) or releasing material made within the the cell to the outside (exocytosis).
It really is an easy project...it just takes a little time. All and all, it took me about 6-8 total hours to make 4 bouquets, 10 bouts (my mom made those though) and about 15 centerpieces. I made two bouquets the day before our wedding and the other two the day of the wedding.
Give yourselves at least two to three months before the wedding date to ring shop. You'll need this time to browse, research prices and revisit rings that catch your eye. If you have your heart set on a custom ring, you'll probably need even more time. And keep in mind: Extras, like engraving, can take up to one month.