A lot of good advice already in the thread. I've been there and done it. It does sound very different at first, and so it should. The important things are to analyse what you are playing to see if it actually works. There may be quite a few songs that just don't work, but don't worry as there will be plenty you can replace them with. We've consciously looked at bands that have the same personnel (Guitar/drums/bass/vox) and picked songs that work for them. You could pull off a few Queen or Jam songs but you'll never sound like Earth Wind & Fire. I'd also say 'embrace the space' that will appear in the music. What you don't play can be equally (if not more) effective than what you do. You can also do a great job stripping down songs to get your own feel and sound.