The Collaborative International Dictionary
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.
Wiktionary
n. A practitioner of do it yourself
Usage examples of "do-it-yourselfer".
Big lumber warehouse with truck loading docks, a cement block operation with about two acres of decorative block stacked gleaming in the sun, a retail store with everything for the do-it-yourselfer, and a clerical office at the end of the building which housed the retail outlet.
If America had competent assassins instead of amateur do-it-yourselfers, your civilization would be more orderly.
There were as many as five dozen slant-parking stalls, each equipped with its own bolted-down toolbox for do-it-yourselfers who had ailing cars but no tools.