I should note that, if you do the procedure above, it will add all of your tracks to the Now Playing List shuffled. If you just play from that Now Playing list, continuing subsequent sessions from where you left off the previous time, it will play through all 1800 tracks shuffled without repeating. If you're set up to prune played tracks from Now Playing (Edit->Edit Preferences->Now Playing...playing tracks list...prune played tracks keep 0), you won't have to keep track of where you were.
If you do the procedure above each time, it will re-shuffle and restart the list, which will lead to duplicates.
If you want to listen to your library through on shuffle without hearing the same song twice, you'll want to do the former.