juggle eggs
v. To perform a difficult feat, particularly a complex mental task that can‘t be interrupted for fear of losing the train of thought.

Example Citations:
juggling eggs vi. Keeping a lot of state in your head while modifying a program. ‘Don’t bother me now, I’m juggling eggs’, means that an interrupt is likely to result in the program’s being scrambled. In the classic first-contact SF novel The Mote in Gods Eye, by Larry Niven and Jerry Poumelle, an alien describes a very difficult task by saying ‘We juggle priceless eggs in variable gravity.’
—Eric S. Raymond, The New Hacker’s Dictionary, The MIT Press, October 11, 1996

An addendum here, a few classes filled there and the schedules I had prepared are useless. Making a schedule here is like juggling eggs.
—Karen Sollazzo, “Registration from hell,” The Gazette, August 27, 1995

Earliest Citation:
Playing the stock market lately has been as tricky as juggling eggs in the parlor.
—David Pauly, “The Public Utilites Bounce Back,” Newsweek, May 24, 1982

Notes:
Also:

You juggled eggs to get me out alive and God knows I’m grateful! But do you expect me to forget that Douglas was behind it?
—Robert A. Heinlein, Stranger in a Strange Land, Putnam Publishing, June 1, 1961

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