mucho va a costar (cambiar eso):
it will be hard, it's going to take a lot (to change that)
The verb costar normally uses a structure resembling that of gustar: pronoun + costar + second verb.
Nos va a costar (mucho) cambiar eso.
It's going to take us (a lot) to change that.
va a costar (mucho dinero):
it's going to cost (a lot of money)costar, futuro próximo
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