I'm a noob to drupal and drush but I was able to install drush to my home directory and create an alias. Although I couldn't get a symlink or the alias to stick, so I had to redo the alias every time I reconnected the server. Drupal.org has instructions for installing on a linux machine. I have been having some fun due to my noobish decent into drupal and drush but I was having trouble with the options, commands, and arguments within drush. No matter how hard I tried I was unable to instal drupal to a certain directory from the call I made to drush in the home directory. Everything was downloaded to the home directory making it a mess. I mv'ed everything but then drush didn't recognize a drupal installation... well needless to say I got it to work but it wasn't as easy as I had hoped it to be. Esp. after practicing on my local server.