QTR-Quadtone RIP

Hello,
I'm a brazilian photographer and my personal work is mainly large format 
landscapes. I've recently joined this list, and yesterday I began to try to 
setup QTR for printing on an Epson 7600 with UC inks (I work on a G4 
running OS 10.3.9). Although I've read Roy Harrington's Basic Tutorial, Tom 
Moore's User Guide and Carl Schofield's mini tutorial, along with many 
useful messages on this list, I'm still quite unsure as to how set the 
whole thing up. I've downloaded and installed QTR 2.3.5, and plan to start 
printing on Epson Premium Luster paper.
I have assumed from some of Roy Harrington's replies to the list that the 
steps necessary for determining ink limits, partitioning the grayscale 
range and linearizing the grayscale output, prior to generating the paper's 
curves, could be carried on the software's graphic interface, instead of 
editing quad descriptor files on a text editor, but I just couldn't find 
out how to do that (I believe one can do that on the Windows version of 
QTR) . I searched the list's files for more recent information, but 
couldn't find any. Is there a tutorial written for the most recent versions 
of QTR (for Macs)? Or should I follow Carl Schofield's instructions and 
work directly on the .qidf files?
Any help would be appreciated.
Regards,
Paulo