Villa scored a shock home success over Manchester City and followed that up with victory at Wigan on Tuesday evening.
The 2-1 victory enabled to climb six points clear of the bottom three.
But Houllier has his feet firmly on the ground ahead of Saturday's home FA Cup clash with Blackburn and Tuesday's away Barclays Premier League clash with Manchester United.
He said: "We have got to not get carried away with what we have done. That is what I have told the players.
"We have to stay humble and very focused and keep working. You can't take anything for granted in this league. Any team can beat any team."
Source: PA
Source: PA