Require considerable effort, as in It'll take doing to get the whole house painted in a week. This expression sometimes is put as take some doing, as in You want the President to come? That'll take some doing! [First half of 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.