You certainly don't need to crush someone's hand, but just be firm. The image you have of someone is formed by many of these small nuances. Creating an image in the marketplace with your own logo and slogan will have people thinking you have been in business for a long time. Use that to create an image of someone who studies, concentrates, is a winner, knows the course, and will be above par. Add a golf club to your logo and tie your slogan into your new image.
Perception is reality with the public.
There is a great deal to learn about the business when you are new to real estate. At least you can have the image of someone successful from your very first day.