How good are you at computers? If you understand the basic structure of folders in your PC, then installing installing small quantites of mods is a trivial task. Installing a lot of mods gets more complex, but you'll learn as you go so there's no feel of difficulty.
And yeah. It is so worth it. In effect, you can tailor the game to be your perfect game.
edit: I mean, just watch the video on FWE's page on the nexus. Then consider how bland vanilla's combat was.
Then consider that, IMO, combat isn't even FWE's best improvement. And you could change the game in any direction, by even more than that.