Na, I use a tripod. Snap a photo to get a feel for focus, then move it in out until I have it dialed in. Usually takes about 4 throwaway shots, then I can adjust slightly until I get what I want in regards to exposure.
I know what you mean about the viewfinder being dark...pretty much pitch black.
I can't wait till my Lester A. Dine 105mm f2.8 macro shows up. It was made for dental photograpy. Haha. I stole the thing off KEH for $70 shipped, supposedly one of the sharpest macro lenses ever; with amazing bokeh.