Sales professionals Jackie Denner and Lorena Cortes share their insights on what it takes to have a successful year in sales at MongoDB. They emphasize the importance of maintaining a positive mindset, working hard and staying consistent, achieving work-life balance, and understanding one's customer base. Successful salespeople also need to be adaptable and open to learning from setbacks and failures. Another key aspect is having a growth mindset, being patient during discovery, and recognizing that success often requires collaboration with others. By following these principles, individuals can increase their chances of achieving success in sales.