The strings on our mini blinds have deteriorated somewhat. Can they be restrung somehow or can an ordinary person replace those mini blinds or should I take it to the dealer? Does the framework around the window have to be removed in order to make the repair or to replace them?
Joyce, (Conifer, CO)
Joyce, (Conifer, CO)

(For additional info regarding re-stringing day/night shades, see this other archived question.)
Replacing the complete assembly, however, is so much easier. Look closely at how they are hung. There will be brackets of some sort that attach the assembly inside or just above the window opening. Though attaching methods vary, rarely will the inside garnish trim need to be removed. If you’re handy with common tools, you should have no problem replacing them yourself.