Best man speech checklists can also be used for memorizing the entire speech.  If you need to memorize the entire speech, write it all down, and practice it for weeks.  Separate your best man speech into the categories on this best man speech checklist, and add your own if you need them.  It will be much easier for you to present your speech on the wedding day if you have your best man speech separated into these different parts and listed on a checklist.  If you simply remember the order of your checklist, you should be able to make the rest come out naturally.