When I started this business 14 years ago, I stopped wearing a watch. Punctuality is important to me, and I am rarely late.
For a go-getter, it's either time to work, time to eat, or time to sleep, and he/she doesn't need a watch to tell the difference.
Now, to the original question:
Hire one that you think will work -- trust your instincts. Then make your expectations clear. Monitor performance to your expectations. Give accurate and timely feedback, whether good or bad. Praise often and publicly. Criticize constructively and privately. Finally, don't coddle anyone who falls short. If the expectations are clear and not achieved, take action to get him/her into good performance, or out. Everyone should find a job they like to do well.