Installation of Edit Orders is fairly straight forward. As with any other modification to Zen Cart, I would highly recommend you create a backup (files and database) before attempting to install.
The Edit Orders distribution zip includes already pre-merged files (for changes this module requires to existing Zen Cart 1.5 files). These pre-merged files can be found in the "Modified_Core_Files" directory of the distribution zip. If no changes have been previously made to the files found in the "Modified_Core_Files" directory you can simply replace the files in your installation with these files. If you have made any changes in your Zen Cart installation to the files found in "Modified_Core_Files", you will need to manually merge your previous changes into the files found in this folder.
You may be interested in reading the following Zen Cart Wiki entry - Useful Tools: File Comparison Utility. In addition to what is listed there, I believe the Apple Developer Tools (Xcode) includes a utility for doing file comparisons and merges (called FileMerge).
I'd say 99% of the professional tools (and environments) for software development I've used over the years include "version control" (and related tools such as diff and merge). If you are not currently using "version control" I would highly recommend learning and using "version control" tools... Especially for medium to large projects and project with multiple contributors. It may seem like extra steps at first, but the long term benefits are worth the cost IMHO.
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