Goals from teenage winger Chris Johnston and striker Kris Boyd secured the points and the Killie manager is hopeful his team's season has taken an upturn with the manner of the win.
Johnston said: "It was a massive game for us and you could see we were a bit edgy. It wasn't our best performance and Thistle played really well.
"It's actually nice to get the three points when we haven't played well because it's happened to us numerous times this season when the other side has struggled.
"Hopefully that is now us turning the corner and we can build on this result. Looking at the league table, it's really tight and it's massive what a couple of wins can do."
Partick boss Alan Archibald reckons his side paid the price for profligacy with Stevie Lawless missing an open goal and Kallum Higginbotham failing to beat Craig Samson when clean through on the keeper.
Archibald said: "The chances we missed cost us. They were two massive opportunities and they don't come much easier than that.
"Stevie knows he should have taken the chance and Higginbotham is the same, although in fairness to him Samson has made a great save and come out and spread himself well.
"It cost us, especially with Stevie's one, because they went straight up the park and scored.
"It feels like we were robbed. To come to Rugby Park and dominate the play but not get the points is disappointing. But I've been saying that all season long - in this league, you must take your chances."