The Reds travel to the City Ground on the back of a league win at Sunderland and last weekend's FA Cup victory over Brighton.
The match will mark Vitor Pereira's home debut as Forest manager, having replaced the sacked Sean Dyche earlier this week.
Slot said at this morning's media preview: "Compared to a few weeks ago I don't think a lot has changed. In the last 19 games we have lost twice and both in extra time and we didn't deserve to lose those games.
"We didn't need yesterday to know how difficult it is to win a Premier League game. What has made the Premier League nicer this season than four, five, six years ago is it's more competitive.
"We have improved compared to three, four months ago. We are in a much better place than months ago. There are more reasons, but the most simple two is how fit we are and that we are much better at set-pieces at the moment."
Forest revenge
Going to the City Ground offers Slot and Liverpool the chance to set things straight after a dismal home defeat to a then Dyche-managed Forest earlier this season.
Slot concedes preparing for Pereira's system will lean heavily on what he sees tonight as Forest are in Turkey for their Europa League playoff against Fenerbahce.
The Dutchman recalled: "Back then it was Sean Dyche's third or fourth game. That makes it a little bit more difficult. We only have tonight to see if this new manager changes personnel.
"The good thing is they have that game, and the manager was in the Premier League last season.
"It's been a difficult game for us at the beginning of the season, first half-hour was very good from us, chance after chance then we conceded from a set-piece and game went in completely different way."
Free week
Along with back-to-back victories, Slot says he and his players also took advantage of a free week to recharge the batteries. The Reds manager granting his squad a short break before Sunday's clash.
He continued: "It's always nice to go home and see the family as they aren't always around me.
"Players, it was nice to have time off, they've hardly had any time off last seven or eight months.
"Did I need the break? Not needed it, no. Maybe if you ask me again in a month it's different. It was nice to have days off but I didn't really need it. Last season I maybe needed it more. I'm enjoying the work I do over here, I enjoy working with the players and the staff."
Isak update
Before concluding, Slot spoke at length about Alexander Isak, with his recovery from a leg fracture now in it's final stretch. Like Sweden coach Graham Potter, Slot is refusing to rule out the striker appearing for Liverpool again this season.
He said: "You do know you're in your final stages of rehab. Next step is of course doing work with the ball and then going into the group and it takes a while before you're ready to play. It's nice that rehab has gone well, compliment to him and our medical staff.
"(Proper pre-season?) It will give us a different player to we had now but we're expecting a different player at the end of this season compared to what he has done up to now.
"Unfortunately for him and us we haven't seen the best Alex. We will next season.
"We all know the moment you go on to the pitch it doesn't take three months anymore (to be back). But these final stages it can change. Let's not put a timescale on it but it's clear he will be available if things go as planned this season."
And in a boost for Liverpool and Sweden, which face a World Cup play-off in March, Slot added: "It will be somewhere around the international break, depends on if he gets a setback.
"End of March, start of April when he's back with the group. Doesn't mean he's ready to start playing straight away."