After downloading and installing(and noting the folder where the exe is installed) the NArrange setup.msi, I go into my new install of Visual Studio and click on Tools and select External Tools.
This opens the External Tools dialogue. Click Add and in the Title field I put "NArrange" and beside the Command field I click the ...(browse) button and go to the folder where I installed NArrange and select the narrange-console.exe file. For Arguments I like to only do one file at a time as I'm working so I set it to $(ItemFileName)$(ItemExt) /b and the Initial directory to $(ItemDir). The /b causes a back up of the file before NArrange makes it's changes, this is necessary to do the restore command below. Then I check the Use Output window checkbox, so that I can see any issues that come up when NArrange runs, and click Apply.
Next I create a restore command. I click the Add button and in the Title field put "NArrangeRestore" and for the Command field I do the same as before. For Arguments I do the same as before except put /r for restore instead of /b. The /r will make NArrange restore the file back to what it was before the last time it ran. Set the Initial directory to $(ItemDir), like the first command. Then I check the Use Output window checkbox and click Apply.
NArrange is now ready for use. When I have a file I would like to organize I just open it and then go to Tools and select NArrange.