"So far this year, I've been relatively happy with my qualifying performance, especially compared to last year, when I had not yet developed an understanding of how to get the most out of the tyres," the 28-year-old said.
"Now, I feel like I'm understanding the car and tyres more and more and that's given me a lot more confidence going into qualifying sessions. It's one of the most fun parts of the weekend because all the fuel load comes off, the rubber goes down and that's when these cars really come alive. They're literally the quickest cars on earth and qualifying really highlights that. It's not often that you don't have a smile on your face with the amount of grip that we have and the lap times we're doing."
The Barcelona track is notoriously hard on tyres and Hartley will have to be conscious of getting the best out of his rubber this weekend, even managing tyre life during qualifying.
"Tyre management will be very important at this track because, even on a qualifying lap, you have to keep the rears alive for that last sector where you need the traction," he said
"You can easily destroy the rear tyres through that first part with all the high-speed corners but it's one of the challenges of getting the most out of the qualifying lap."
Hartley is on track for the first time this morning with two free practice sessions.