hold the nettles of

To grasp the nettles of. . .

If you grasp the nettle, you deal with a problem, or do something that is unpleasant, quickly and in a determined way

سر و کله زدن با سختی ها و مشکلاتِ . . .
از پس مشکلات و سختی های . . . . پس آمدن