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.
I had never heard, before The Knot, that the wedding invitations must go out first. It's essential that all shower guests receive wedding invitations, also. If it will make you feel better though, go ahead and send the wedding invitations out at 11 weeks, but use the original RSVP date. The 4 week notice for the shower is perfect. I'm not really sure about this one either, but I would think 11 weeks is plenty of time.