What's the best Harry Potter mod for Skyrim? Preferably not just a skin mod, but one which changes the locations and such.

I don't know of any. Maybe you could try searching Nexusmods to find some and report back.

I thought I remembered there being a School of Wizardry mod on the Nexus.

I don't know how Potter lore friendly it is but I found it:

http://www.nexusmods.com/skyrim/mods/22937/?

Maybe search NPC companions on the Nexus for characters from the movies to help populate it.

Thanks! I see it has 107,213 downloads, so they must have done something right.

I am still completely new to the game, I've got a question about mods. If you only want to play a game with custom locations (not modding the game completely, just exploring some houses, such as Hogwarts), is that something that's quick and easy to do, and quick and easy to "reverse" when you want to play the game in the ordinary way afterwards?

I'd very much like to explore custom places/houses in the game.

Yeah you can activate and deactivate the mod in the data section of the Skyrim launcher.

Eh, the number of downloads doesn't necessarily mean it's a great mod. You want to look at the number of "Unique Downloads" - and the number of endorsemants.

You should always look at the top couple pages of comments on a mod's webpage to look for problems being reported as well as reading the mod authors webpage for install instructions.

I tested tons of mods, then when I was ready to start playing for awhile I deleted everything Skyrim related off my harddrive including my INI files and NMM. Then I did a clean install of the mods I wanted to play with.