Meaning that a task is easy when assistance is given.

He needs a lang-shanket spoon that sups kail wi' the deil.

"He that has to do with wicked and false men had need to be cautious and on his guard."—Kelly.

He needs maun rin that the deil drives.

He ne'er did a gude darg that gaed grumbling about it.

"A gude darg" means here a good day's work.

He ne'er tint a cow that grat for a groat.

Literally, he never lost a cow who cried for the loss of a groat.

He never lies but when the holly's green.

The holly being an evergreen, that is to say, a person never speaks truth at all.