1) Go to Karstadt and most likely find a guy searching for a wedding costume with his mother. Wait until they get at the ties department. The guy's mother will reject several ties because they make him look like a lawyer. Select one of those ties. Check with the sales woman who will tell you that indeed this kind of tie is very fashionable for this time of the year.
2) Look up websites that explain how to tie a tie. Preferably a French one.
3) Don't forger your body language!
