Believe it or not, I still encounter plenty of people (mainly coordinators) that do not know how to pin on boutonnieres. So, I have created a small graphic that you may print out and add to your emergency kit. If you are a coordinator, I would almost say it is a REQUIREMENT to know how to handle boutonnieres.
And, if you would like to learn how to make a boutonniere, (because trust me, sometimes things happen and you might be asked to make one on the spot) I would go to a local florist and ask them to teach a workshop on basic boutonniere making. I am probably going to make a tutorial video soon on how to make them, but its wedding season and I have no time at the moment. BUT, I have listed the items you need to create them: