The 30-year-old has scored 11 times this term in a struggling side and admits he was surprised by his early season form.
"It was crazy," Pukki admits. "I did not believe that it would go that well. It gave me the confidence that I could do it at this level and it helped me a lot.
"Those were some good periods for me but there have been tough periods this season since then. That is where I need to improve. I need to keep my level up and be more sharp.
"Last year, in the Championship, I always knew that there would be another chance coming so it was easier. In the Premier League, there are only one or two chances in a game so you have to take them. That is what I need to improve. I need to be more precise."