Remote Sensing in QGIS
If you are bored with commercial licences of professional software solutions, try to migrate yourself to open-source. Download, install and run QGIS with proper plugins. Below you may find the brief manuals on how to deal with fundamentals of remote sensing imagery processing.
QGIS software official webpage.
Four basic detailed image-tutorials for download:
Data pre-processing in QGIS
Conversion DN to Surface Reflectance
Radiometric and Spectral Image Enhancement
Options of Image Classification
