Nottingham Forest's tactics for the match were actually very simple. They would create a tense atmosphere for Barcelona to play in by passing the ball about quickly and snatching it from their players ferociously. Those actions would stir up feelings of agitation within the Barcelona players and cause them to perform poorly. The venue in which they were playing would also assist them greatly in creating an environment that was difficult for the Barcelona players to play in, as well.
Barcelona was well-known as a team that was not good with headers in both its defense and offense. This prompted Tony Twain to research aerial tactics, so as to capitalize on this particular weakness of Barcelona's.
Nottingham Forest gradually seized the initiative on the pitch after Barcelona tossed aside the advantage they had at the start of the match.