"He has always been Mark [Purdon]'s horse so he does almost all the fast work with him and then on easier days one of the staff, often his regular handler Jimmy, drives him so I don't have a lot to do with him."
Rasmussen knows enough about Self Assured, from being around him every day and driving against him, to rate his chances against some of his key rivals. She says he should win.
"He looks the best horse here.
"He has so many ways he can beat them. If we step well and he gets the front he will be too tough and classy for most of them and if we have to drive him with a sit I think he will be too fast."
Of the rivals Rasmussen has driven she says Spankem, to be driven by Tony Herlihy, is the biggest danger but he has knocked off at the end of 3200m races before.
"I just don't think he is quite as good over this trip but I can also see him being in the money for sure.
"Bettor Twist is a wonderful mare but has found it hard in this grade against the boys and is off to stud soon while South Coast Arden is a really good horse but he has had a tricky campaign. So I am on the horse to beat for sure."
The start of the Cup could determine the finish because if Self Assured can stay in front of the three unruly horses, all of who are strong leaders, he looks almost certain to get the lead and that could be race over.
But if he takes a misstep at the start and settles behind his unruly rivals the complexion of the race may change. He can still beat them with speed that is a lot harder way to win.
Spankem is the second pick, while A G's White Socks and open-class newcomer Cranbourne have been outstanding this autumn and can place.