My personal plan was to organize my loans based on interest rate and then attack the smallest loan in the highest rate, working down the categories, until the last loan I paid off was my largest loan with the least amount of interest. Focus on one loan at a time, paying the minimums on all the others.
For example, if these were my loans, this would be the order I paid them in:
1. 3,000 @ 6.8%
2. 5,500 @ 6.8%
3. 6,000 @ 6%
4. 5,000 @ 5.5%
5. 5,600 @ 4.75%
6. 10,100 @ 4.75%
7. 10,000 @ 3%
For me, this accomplished both the tackling of high interest rates first (and thus saving some money over the few years that I did this), and the creation of motivation through seeing loans being completed. The snowball will be slow at first, but once you have one or two loans knocked out, you'll surprise yourself with how fast this can go.