The Owls are in a resurgent mood and remain unbeaten following the dismissal of former head coach Jos Luhukay.
Back-to-back wins over Preston and Middlesbrough were followed with an encouraging point away at high-flying West Brom in the final game of 2018.
Wednesday now return to Hillsborough looking to extend that impressive sequence.
And Jones, who came on as a second half sub at the Hawthorns, says the belief is flowing again at S6.
'I think we've got some belief and the lads are putting in a good shift and are working hard," said the 34-year-old.
'We're enjoying it so I think it's been a good week for us.
'Birmingham are going to be a tough one '“ they're having a good season and we won't be taking anything for granted.
'But we're at home and we're going to have a real go.
"We'll get at them and put our stamp on the game.'
On a personal level, Jones' appearance against the Baggies was his first since featuring in a League Cup tie back in August.
He hopes the good run of form continues into 2019.
He added: 'I think good results brings confidence.
"To have had two big away games and to get two good results shows that we're moving in the right direction."