There was good bounce and if you get balls in the right areas a few of them skid on as well
Monty Panesar said he retained trust in England's selectors despite having to wait until the third Test in Perth to make an appearance against Australia.
The Northants spinner excelled, taking 5-92 in Australia's total of 244.
And he said: "It's nice that people back home have been clamouring for me to play international cricket.
"I want to play most games but the selectors know what's best and I trust them. They felt now was the time for me to play my first Ashes Test match."
Panesar's 24 overs brought him the key wickets of left-handers Justin Langer and Adam Gilchrist.
He also accounted for three dangerous lower order customers in Andrew Symonds, Shane Warne and Brett Lee to become the first England spinner ever to take five wickets in an innings at the Waca.
He said: "I bowled with good rhythm and tried to get the ball in the right areas and am pleased to get five wickets at Perth.
"These are the sort of things you dream of, playing Test cricket and taking five-fors.
"But for me I'm just grateful to get the opportunity to play more than anything.
"Bowling on a first day pitch was quite tough and it was important to me that I focus on my own game and not let my team-mates down."
We are going to be look to be positive again, show good aggression and look to bat well
All-rounder Symonds hit Panesar for 17 runs in an over, but the spinner soon had his revenge.
"Sometimes you've just got to acknowledge that batsmen do play good shots. [Symonds] hit really well but we didn't panic."
Though there was no lavish turn on offer at the Waca, there was a bit of bounce and Panesar, tall for a spinner at 6ft 1in, was able to exploit it.
"There was good bounce and if you get balls in the right areas a few of them skid on as well," he explained.
"So with the bounce and natural variation off the pitch it kind of helps the spinners out here."
A positive outlook will be vital for England through the remainder of the match, said Panesar, as the tourists closed day one on 51-2.
He said: "We were very positive in the two-day game in Perth and took that positive energy onto the field today.
"That determination showed in how well we coped out there.
"We are going to look to be positive again, show good aggression and look to bat well."