depends what you mean ,.....masks are only as good as the sculpt,......it's def worth taking your time on the sculpt,.....do everything needed before molding ,......slip latex and silicone do different things and look different,.....
silicones heavier and harder to paint,.....plus it's slightly more expensive,.....
i'd say start on the sculpt and go thru molding tutorials that way you don't ruin the sculpt and get aggrivated,.....
it's worth taking your time,.....no matter how long it takes,.....
feel free to look around or ask questions buddy