Yes, 20+ flies are tough.
1 -- use a magnification light as discussed on another thread
2 -- don't overlook the value of floss or flat waxed nylon
3 -- contrasting thread makes fine ribbing on tiny flies. Rod wrapping thread works well for bodies.
4 -- Craft stores sell "seed beads" which work for bead head flies
5 -- one or two strands of calf tail work well for many patterns