Meshmixer is a 3d modeling and design program, but unlike others it is designed for manipulating 3d models which have already been created. It can adjust and re-size models, stretch or skew specific aspects of models, or even incorporate multiple models into a single object for 3d printing.
The School of Science and Engineering (SSE) maintains a limited site-license for student use of Solidworks 2014. It is available on many school-owned computers, students may request an individual copy for their personal computers under the SSE license.
The recommended method for learning Solidworks is to simply work through the Tutorials provided with the software. The program also contains an elaborate "Help" system that will answer most questions as they arise.