It Costs Money - You need to pay for the course to become licensed, for the exam, to maintain your license & association fees (both local and national). However, still one of the cheapest costs of entry into owning your own business.
Traction Takes Time - Building clientele takes time. You may not receive any money for up to three months or more depending, so make sure you have money put back for your expenses at this time.
Your Friends & Family May Not Want to Work With You - Some of your friends and family may already have a relationship with a Realtor and others may want to work with someone more experienced.
Scheduling Issues - Even if your are your own boss and can do your own scheduling, you will still have to work with other people's schedules as well to be able to show houses etc. It may take a while to find the best schedule for you and your family.
It Feels Like a Waste of Time - It takes patience and time to build your business, but, stick with it. You will be building experience, potential future income and relationships.