The 65-year-old was appointed at the Loftus Road helm a week-and-a-half ago with the remit of keeping the Hoops in the Premier League.
Asked if keeping QPR up would be his biggest achievement, he said: "Of course, absolutely from where we are. We will try. It is going to be hard.
"I've taken a big task on here. I know what I've taken on, I'm not a fool. It's going to be difficult but you can only give it your best."