do-it-yourselfer

from The Collaborative International Dictionary of English v.0.48

do-it-yourselfer \do-it-yourselfer\ n.
   a person who often makes objects typically made by
   professionals, or performs repairs typically performed by
   professionals, though not having professional training in the
   relevant art. The term is used mostly to refer to activities
   related to maintaining a home.
   [PJC]