Vicki,
I know that the last thing you need right now is more advice but I'm going to offer some anyway. If you've already thought of it then I apologize....
When you have the hydraulic clutch put in, you should really consider having your pedal cluster moved to a position that is more comfortable and suits your height (Assuming, of course, you plan to keep the car for a while). I would also have the entire clutch assembly checked out at the same time....It sounds to me like something in your clutch assembly is in a bind which is causing the "tightness" you describe which in turn, may be causing your clutch cable failure.
Like others here I driven old VW's and Porsche's with the cable type clutch system. The system is archaic and does require some muscle to get initial movement, but what you're describing sounds inordinately stiff and it just shouldn't be that way. If that is the case, adding a hydraulic clutch may solve part of your problem, but it may exacerbate the condition that is causing the stiffness in the first place and could result in some expensive damage within the clutch asembly itself.
Again, this is just my opinion.
TMc