"There is a real feeling of a first step on a long journey rather than approaching the end of something," said Williams, confident Scotland can upset favourites Wales at the Millennium Stadium.
"That's a really healthy feeling to have. There is a good atmosphere in the squad and we are way ahead of where I expected us to be. But we know it is going to be a difficult first step.
"I am a great believer that the national team represents the character of the country and the Scots have always been great inventors.
"We have a warrior, soldier, fighter tradition and that is what I want. We will show a character that will make the nation proud and play a brand of rugby that they will want to see us play.
"If we get our players playing with passion and pride - and I'm not suggesting they haven't in the past - that will ignite the Scottish public.
"If we achieve that against Wales then we will be delighted and if we do so then the scoreboard will look after itself.
"Every single time we walk onto the field we will try our best to win but we are saying that with this young side it is unrealistic to expect us to win every game.
"We will never be happy with defeat. We will never walk off the field with me telling the guys it's all right to lose. It never has been and it never will be."
Williams has included three uncapped players in his first Six Nations team in Edinburgh centre Tom Philip, Borders scrum-half Chris Cusiter and Edinburgh back-row forward Allister Hogg.