There are small manual needle threaders you can buy (Walmart probably has them), usually 3 to a package for a couple of dollars. Basically you thread the needle threader, then place the wire in the groove of the needle (near the top of the groove) and slide down until the wire goes through the eye.
Placing a card behind the needle helps too. Bernina feet have a white coating on them for this purpose -- to see the needle eye better. You could use a colored card for white thread, a white card for colored thread.
Here's what they look like:
http://www.amazon.com/Prym-Dritz-R-N...dp/B001HZSK5Y/