To add beads to your memory wire, place the beads on a beading mat (I like to use a piece of velour blanket that I've cut into several placemat-sized beading mats) or other work surface that prevents the beads from rolling around. Then use the end of the memory wire to string the beads onto the wire instead of picking up the beads one-by-one and adding them to the wire.
Instead of pushing your beads down the length of the wire as you add them, hold one end of the wire in each hand and stretch the wire out from top to bottom, allowing the beads to slide down to the end. I find this helpful in determining how many beads I still need to add.