Yes, it can be effective if done correctly by an experienced surgeon. My uncle had done this years ago, there are certain things to consider before going for the hair transplantation;
1. You should go for a proper diagnostic procedure to find out the cause of your baldness. There are many different kinds and most of them could be successfully treated. But, knowing your type of baldness helps greatly in treatment.
2. Doctors need to know the patient thoroughly to study the hair type, infections on scalp, number of hair follicles, health condition and other patient condition. This patient selection process is supposed to be the most important step.
3. The next step is to consider intense surgical factors including hair-line design.
If done correctly, you should see great results. All the best to you cousin!