Seems you got difficultes to create another partition on your drive for installing TC. Don't know how to solve your partition problem - but there is another possibility, if you shouldn't succeed your way.
An alternative to a separate partition would be to install TC as guest system within Virtual Box.
Virtual Box is offered for Fedora 12-
Link.After installing Virtual Box just follow the installation guide of TC (with TC iso mounted as CD in Virtual Box Settings) -
Link.
Instead of rebooting shutdown as last step, switch off the mounted iso in Virtual Box Settings, start Virtual Box again and you should be done.