I'm going to get my floyd rose locked up soon, but in the meantime I basically can't change tuning. I want to learn some downtuned songs (tuned to D-G-C-F-A-D, so all strings one step down). Am I correct in assuming I can just learn the songs with standard tuning, it'll just sound a bit high?
yeah, tuning down a step doesn't change the way a song is learned. If you try to play it with the song though, it will sound out of tune.
exactly. every note and chord u hit will be one step (two frets) high if you play a standard tuned guitar while playing a detuned song.