Another option would be to hire a Project Manager to look after build.
Its kinda in between Self build and a Builder.
I am just about to start building in Galway County, and have hired my engineer to source the labour, materials, and manage build. He recokons that I will save at least twice his fee, as he can get materials cheaper and able to make sure all the build goes to planned.
I do not have much of a clue about building so total self build was not an option ... but learning quickly ...