The 28-year-old thinks the Merseysiders will be dangerous opponents but insists the momentum his side currently have means they can be confident of getting the result they want
The former Portsmouth man is hugely enjoying a season on Tyneside that has seen the Magpies cement a European spot in the league but he is wary of the danger posted by the Anfield side.
He told Newcastle's official website: "Liverpool have the likes of [Luis] Suarez, Andy [Carroll], [Stewart] Downing and many others who can hurt you. They have some fantastic players.
"It will be tough but hopefully if we can apply ourselves like we did last weekend at West Brom, then it can be a good game.
"We are carrying some momentum at the moment and have got a huge chance against Liverpool.
"There is a great buzz about the place at the moment. We are a hard-working group of lads with a good mentality and, obviously off the back of two good wins, we are looking forward to the big game on Sunday."
One player who won't be lining up for the Magpies on Sunday is Fabricio Coloccini who is expected to miss the next month with a torn hamstring.
Williamson admits it is a huge blow to lose their inspirational captain but believes other players can deliver in his absence."It's a big loss, Colo been huge for us this season. He's not only our captain, but also a fantastic player," he continued.
"But the second half at West Brom showed that we have enough in the squad to cope without him while he is out.
"[James] Perch came into the middle and he has been one of our best players in recent weeks.
"He proved again that he can step in, be it at left-back, centre-half or wherever, and do a brilliant job."