Ok so I have an Avalonian Knight with the Legendary major glamour.

I need to lift something really heavy so I want to add my ranks in Legendary to my major trait (Brawn)

How do i do that?

Do I need a raise to use Sorcery? If i do then what raise do i use? As I don't have any till i roll but then it would be too late to add the ranks for the roll. Is it just a matter of spending a hero point?