Don’t let that Don Draper – Mad Men image influence you. These five habits are simply courteous, whether for a job interview or a sales call.
Arrive on time, not early and not late. Be respectful and find out what they want and need; not what you want and need. Be yourself, but use some discretion. No one wants to know the details of your personal life. Be appreciative by saying a heartfelt thank you.
Seriously, this should come naturally. If it does not, practice, practice and practice some more and then think about why this does not come naturally to you.