[trussi]

If you have clear technical requirements defined, use oDesk.

Put out a $25-50 test job. Make sure to invite as many contractors as you can (the oDesk UI is absolute garbage, so this is a slow, painful process). Pick the 10 best for the test job.

Look for ability to communicate, quickness of turnaround, level of hand-holding and the quality of their work.

Pick the best 2-3 and get busy. I personally prefer to use hourly workers because my requirements tend to change all the time.