You half memorise it, sit down with your speech and read each sentence to yourself, then look in the mirror and repeat each sentence back. When you're first learning it you take time to read those sentences before speaking them but eventually you can just glance at the first word in the sentence and remember the rest of the sentence, works like a charm.
If all else fails, get a powerpoint and put your notes down the bottom so you can read them.
The semi memorise thing though doesn't take very long, like 3 run throughs and you get it, then on the palm card you can just write down the start of each sentence.