Difference between Number Cruncher and Dab Hand

NUMBER CRUNCHER vs DAB HAND: NOUN

An accountant or other person who deals with the calculation of numbers as a profession.
A person who performs numerous calculations, especially an accountant.
A computer that is able to perform complex, lengthy calculations.
Someone able to perform complex and lengthy calculations
A computer capable of performing a large number of mathematical operations per second

Programmer, Investment banker, Econometrician, Actuary, Sabermetrician, Mathematician, Dealmaker, Accountant, Prognosticator, Pencil pusher, Spinmeister, Psephologist, Cruncher, Statistician, Wonk

Boffin, Bureaucrat, Wheeler dealer, Programmer, Econometrician, Actuary, Sabermetrician, Mathematician, Accountant, Prognosticator, Pencil pusher, Spinmeister, Cruncher, Statistician, Wonk

But I am a writer, not a number cruncher so any help would be eternally appreciated.
As a young number cruncher this is a worthy goal.

TV star has proved to be a dab hand at tasks, taking control of each challenge with a clear head and determination.
Story highlights We've sourced 5 of the best bloggers Africa has to offer (CNN)A dab hand in the kitchen?.
Also a dab hand at Alchemy and can whip up any combo in multiple quantities in no time.
Mike - hospitable host at your home - dab hand with a barbecue and home-baked bread maker.
French composer was also a dab hand at reworking his own solo piano works for full orchestra.
She was a dab hand at Potions, Lily was!
Track playset includes a dab hand crafted, not be bored.