The world and European champions sit top of Group I, level on points with France but having played one game fewer than Didier Deschamps' side, as well as boasting a superior goal difference.
They host Belarus on Friday at Mallorca's Iberostar stadium and if they can pick up the three points, they will need just a draw when they host Georgia next Tuesday to qualify for the World Cup.
Talk of Del Bosque's future beyond the World Cup and of whether Atletico Madrid forward Diego Costa could represent Spain at the tournament has dominated press coverage leading up to the game, but the coach insisted the games with Belarus and Georgia should be the only things his side concentrate on.
"We'll see what happens in the future, but the present consists of the six points we are playing for and we cannot allow ourselves to become distracted," said the coach in a press conference.
"Football has the capacity to betray you and we have to be prepared, we cannot allow ourselves to get carried away by being over confident."
Despite reiterating the need to finish the job, Del Bosque admitted his side were well placed to make it to Brazil.
He said: "We are in an ideal position to qualify for the World Cup but we need to ratify what we have done up till now. These last two matches are like finals for us."
Spain beat Belarus 4-0 in Minsk last October, with Jordi Alba opening the scoring and Pedro Rodriguez bagging a hat-trick.
Things will be even tougher on Friday for Georgy Kondratyev's side, who have conceded an average of two goals per game in qualification, as they will be without former Barcelona and Arsenal midfielder Alexander Hleb, who is suspended.
Swansea forward Michu could make his debut for Spain in Mallorca after receiving a late call up as David Villa and Fernando Torres were ruled out due to injury.
The 27-year-old told a press conference that being named in the Spain squad was "my greatest achievement", and declared: "I've come here to take advantage of this opportunity, enjoy the moment and help my team-mates sew up qualification for the World Cup."
Del Bosque added: "Michu has made a very good impression on us in the last two days."