The 2-1 victory against the Toffees moved Brian McDermott's side out of the relegation zone for the first time since August courtesy of Adam Le Fondre's second-half double.
Steven Naismith stabbed the visitors in front in the opening period before Phil Jagielka's effort was scrambled off the line, but last season's Championship winners bravely fought back from behind to clinch their first maximum haul of the campaign.
The 28-year-old Tabb is confident that it could prove to be the turning point in their season's fortunes.
“It’s been a long time coming, but the result shows we can compete at this level," Tabb told the Reading Post.
“We knew that before, but we weren’t getting the wins so I think it can be a turning point.
“You look at the draws we’ve had; a few of them could have been wins, so it’s a game that’s going to build confidence.
“Everyone came in happy on Monday and trained well and we now know we’re capable of winning games in the Premier League.”
|BACK-TO-BACK ROYAL WINS|
|3/1||Reading are 3/1 with William Hill to win at Wigan this weekend|
McDermott's side will be hoping to make it back-to-back wins on Saturday, when they travel to the DW Stadium to face Roberto Martinez' Wigan.
The Royals have had to wait a long time for their first win, but the former Coventry City man believes it was about time his side had the rub of the green.
Tabb added: “You don’t usually go into November without a league win so it was something we definitely needed.
“Looking back you could say Everton could have been a couple more ahead at half-time, which is fair, but I thought second half we showed what we’re about and deserved the win in the end.
“It’s nice to be out of the relegation zone because sometimes if you win and don’t move up a place it can be disheartening.
“It’s nice to win and move out of the bottom three and our aim has to be to stay out of there for the rest of the season.”
“We’ve had our fair share of bad luck this season but the confidence is there now to build on it and get a few more.”