Measure and cut elastic thread to a length that will encircle glass, plus several inches to tie off. Thread first group of beads on elastic thread, test for fit and tie off. Now you can pre-cut a number of pieces of thread and continue threading until vase is completely covered.
Fill vase two-thirds full with water and floral preservative. Cut stems of flowers (here I used lisianthus) to correct length so that the flowers sit just at the top of the rim of the glass. Continue until the vase is full.