Like Ikea furniture assembly, for short (3)
I believe the answer is:
diy
(Other definitions for diy that I've seen before include "Intially, the home handyman's work" , "Initially, description of home handyman or his work" , "Initials describing activities of self-sufficient worker in home" , "Initially, an acronym for domestic craftsmen" , "Acronym for home handyman's work" .)