Are Lao Tzu's prescriptions for behavior realistic and practical? Explain.?
Absolutely. Taoism has a lot to do with getting out of your own way, trusting your instincts, and of course, following Tao.
Yes. They are very realistic and eminently practical. One of Lao-Tzu's underlying principles is that the more laws you make the more criminals you create. This is simply a truth. Once upon a time in New York State in the USA one could decide whether one wished to wear a seatbelt in one's car. Now it's a law that you must wear a seatbelt. If you don't wear the seatbelt you're breaking the law. In a park by my house one could once sit in a gazebo and smoke a cigarette - now that's against the law and if one smokes in the gazebo one is fined. I'm not saying these laws are good or bad - I'm saying these laws make humans who are exercising their free choice into criminals. Fewer laws equal fewer criminals.
Lao-Tzu's well known statement that one must "Yield and overcome, empty and become full, bend and become straight" has been used in treatment for alcohol and drug addiction in encouraging acceptance of a problem and one's responsibility instead of denial and chemical dependence.
In the proper cultural context I would wager that they are effective as a means to live a fulfilling life