He told avfc.co.uk: "It's all about taking my chances. That's the same for any striker - or any player really. If you haven't been in the frame for a few weeks and suddenly you're thrown back in, you have to go out there and do your best to stay in there.
"I've had a few games for the reserves and I've tried to have the right attitude. When you're putting on that shirt for Villa, you've got to do your best whatever level you're playing at - youth team, reserves, first-team. You've got to go out there and do your best to show what you can do.
"If you're doing well and the manager's watching, he'll chuck you in and give you a chance to show what you can do."
The goal at Ewood Park was Harewood's 100th League goal, though the 28-year-old admitted: "I wasn't really aware of that at the time. It was just nice to get a goal for Martin and the rest of the team. It was nice to play my part in a big win.
"Getting my first league goal for Villa is really important - especially at a place like Blackburn, because they've been doing really well."