The last time I checked I think Nottingham is indeed a roll with their high team spirit and with their impressive performances this season, I think their are currently sitting on 3rd place in the premier league table standing with 54 points from 29 matches I think, their recent win against Manchester United with an score of 2-3, this chances will boost their confidence.
Why it's very hard to predict their upcoming matches, but from past analysis I think Nottingham forest has already beaten them one's this season, however Manchester United will likely be looking for revenge and I think the match will be an contest one between the both teams only if Nottingham forest can maintain their momentum they could potentially achieve their greatest chances of winning this season.
Nottingham Forest continued to make us surprising and let's summarize their situation now with points and rank. They played 29 matches, and have 54 points, that is 4 points less than Arsenal, but it's more important to check clubs below Nottingham Forest. Chelsea with 49 points, Manchester City with 48 points but both played 29 matches like Nottingham Forest. Newcastle United have 47 points but only played 28 matches so they can have up to 50 points after playing 29 matches.
Assume Newcastle United win that match and have 50 points totally, they will have 4 points less than Nottingham Forest, and that situation means Nottingham Forest have 4 points less than Arsenal at a second position but 4 points more than Newcastle United at a fourth position. They are in a middle of top four and on verge of falling out of top four or top five. They have to continue fighting to secure a position at least in top five and go straightly to UEFA Champions League next season. With 4, 5 or 6 points against three competitors (Chelsea, Manchester City and Newcastle United), it's good advantage but not big and safe enough for Nottignham Forest.