You know I really haven't seen 'funny face' yet but maybe I should netflix it given my husband is in love with Audrey.
As for the poofs they ARE a bit time consuming I also had the help of friends and my wonderful church to help make them. Otherwise it would have been an eternity. I did however recently come across coffee filter poofs that look like they are faster to put together.http://www.dandelionandgreyblog.com/2009/12/creating-garland-from-coffee-filters.html
there was also another method I couldn't find a link for but you just thread a small stack of coffee filters in the center, tie knots at the front and back of the stack and crumple them up. Gosh I wish I had bookmarked it.
About the self catering I say go for it. As long as you have a lot of help to make and serve the food. Buffet style serving would be less of a hassle and having a separate area where beverages are served is best.
Good luck I'm sure it will come out great