Levein played without any recognised forward in a formation described by local media as "4-6-0" in the Czech Republic on Friday and lost a tight game 1-0.
He was asked if he had been stung by criticism of the tactic.
"You're assuming I have read any papers, which I haven't," he told reporters. "I am very positive about this match. In fact I'm excited and looking forward to it, and the players are too."
"Here's how it works: I got the job and the job is to try and qualify for the Euros. I'll do that the way I think is right. If it causes a little bit of a stooshie (fight) and some of you press guys get upset, then so what?," he told reporters.
"That's not my concern. I've got a group of players who I believe I can work with and who everybody who watched against the Czech Republic realised they put everything they had into the match. For me, that's a great starting point and we move on."
"We are probably facing the best team Scotland have ever played, that's how highly I rate Spain," Levein said.
"We'll have a go and see what we can do.
"It's a game that we'll try and express ourselves and try and win. I'll name the team as per normal this evening."
"I don't think so (that they will play defensively) because they played with two central midfielders as forwards and they only pushed forward when they fell a goal behind," he said of the Czech Republic match.
"Tomorrow, as the home team backed by their fans, they will try to attack our goal more than the other day."
Del Bosque's last visit to Hampden Park was in 2002 when his Real Madrid team beat Bayer Leverkusen in the Champions League final thanks to Zinedine Zidane's brilliant volley.
"Fletcher controls the centre of the pitch very well," Casillas said of the tough-tackling Manchester United man.
