That's hard, of course.
In case you get the S2R+.pack file ready to copy/paiste, then you need to find this
C:\Program Files (x86)\Steam\SteamApps\common\total war shogun 2\data
The red part is an example, it might call slightly different in your system. Everything else should be the exact path also for your system.
Put the S2R+.pack file into this data folder, and ready. Start the game as usually.
Same goes for compatible additional mods, most S2 mods use the so-called movie format which means they work instantly if added to the data folder.
Edit: ... and it doesn't damage your original game files, just uninstall any of such mod files (if you do not like them) with deleting the added file from the data folder, but only them, not touch any of the original data files (so you always should know exactly, which are modfiles, and which not).
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