I may not be an expert with Daft Hands but probably these are some of the tips required to do a pretty Daft Dance.
1. Exercise your fingers before every practice. Stretch the bones and muscles from your palm onwards.
2. Choose songs with lesser words on their lyrics. It would be easier to synchronize your fingers with the words. Find words with similar letters at the back. eg. better, stronger, faster. All of them end with -er at the back. Seperate the -er with the words on your hands.
3. When writing words on your hands, get those marker(preferably) which can be washed away easily. You don't want to spend most of the time washing your hands after practicing. Write the words CLEARLY. You do not want audiences to stretch their eyelid every time they watch your performance.
4. Listen to the song MANY MANY TIMES. Especially the beats of the songs. Daft Hand Dance not only required you to show the words to the audience, but also move your hands according to the beats and make it more lively.
5.PRACTICE, PRACTICE AND PRACTICE. Do not give up. Practice makes perfect.