This Reddit poster did a good job at summarizing the key elements everyone must understand. I would add:
1- understand that genetic balding is progressive and over the years more hair loss may occur until you reach your final genetic pattern so your Personalized Master Plan should account for this possibility
2- be sure you research the doctor you are going to use and develop a Personalized Master Plan for your hair loss with that doctor so you can set realistic expectations. Although coarse hair is the best hair caliber, many men get great results with medium weight hair and even fine hair if the balding pattern is not very extensive.
3- realize that over the years, hair character changes with age, often becoming finer so plan for these changes in your Personalized Master Plan