I can't say that I have ever found this to be a problem. I have basically two places where I keep my books at home. One is where literature is to be found, broadly ordered by language (German, English, French, a little Greek and Latin). This is where Nietzsche can be found. The other is for Philosophy (and other non-fiction).
Those who seek guidance might find this interesting. Be sure to read also the comments!
No further comment—at least not by me!
1. Actually, there is a third place now: my computer(s). See also here.