Grant saw his new charges beaten 4-1 on home soil by Manchester United at the weekend, leaving Pompey seven points adrift of safety at the foot of the Premier League table.
However, former Chelsea boss Grant commented: "I don't have enough experience at the bottom of the leagues - I am guilty. I hope I will not have much experience of this.
"I've spent more than 90 per cent of my life at the top, but I know what I need to do here. I have a lot of experience in football.
"One thing I always say to myself when I come into a situation like this is 'get used to it as soon as possible'.
"I'm not looking back and saying I was managing top teams and now I am here. I have a job to do and I am going to do it.
"It was not the dream of my life to take over a team at the bottom. If you had suggested I'd have experience of this over the next few years, I would have said no.
"But I think it's a good challenge and that's what's important. In sport, you have different challenges and different places.
"I'm very excited about this. This was the first team I came to over here and when they asked me to help out, I had to do it.
"Of course, I could have waited and looked for other challenges, but that's not me."
Source: DSG
