First step in my experience is to:

1. Practice Memory Exercises and train yourself up to sequences of say 20 objects or spelling of random words;
2. Study the Postal Exam Guides
3. Go to the SPCA and learn about interacting with Dogs of all types and owner disposition
4. Walk five to six miles a day to get your body in shape for approximately this amount of walking between your Postal Vehicle and mail box's
5. Talk to a current postal worker that works the counter and several who are on routes to discover if this is really a role and career for you
6. If you can, talk to a Mayor or State Congress Person about the role of Mail Carriers to gauge their interest and respect for this vital service and follow their recommendations for next steps into one of these roles.