Which Rubies? The Jango, Deluxe Jango, Collectors Jango or Boba? Some of them need a fair bit of work (as luck would have it, you've come to the right place!)
What condition is it in? Unless it's already been done, you'll need to cut out and replace the t-visor (I recommend doing this after you've repainted to avoid the risk of getting paint on you nice new visor). If the helmet is deformed you'll also need to reshape it, this can seem like a lot of work but there are reshaped Rubies Boba's on TDH that look amazing, and there's alway someone willing and able to guide you through how to do it.
Good luck with it, and post pictures of your progress. Oh, and ignore Addboy! There's nothing wrong with owning a Rubies.