here are a couple of additional tips:

you don't need to create the .ssh direrectory yourself, ssh-keygen will do that for you if its unable to find it. 

And to copy keys: 

ssh-copy-id -i .ssh/id_rsa remoteuser@remote.host


You can also use ssh-copy-id to copy over your key to the remote host as well.  If no .ssh  directory or authorized_keys file exists, it creates them or if they do, it appends the key to the end of the authorized key file.