Lambert scored twice from the penalty spot in the 2-0 victory as the Saints moved on to minus 2 points at the foot of the table - having started the season on minus 10.
And the former Bristol Rovers hitman is now targeting the zero points marker as the next springboard to sent them up the league.
"We've been waiting for the first win together and it's a big relief so let's just push on now," he said.
"Results are everything and we were getting frustrated, but we knew that the way we were playing that we weren't far off, and that the first win was just around the corner.
"When we get to zero or one point I think that will be a massive mental boost for us so we're just trying to get out of the minus as fast as we can."