Clutch advise please

oK i need some Fiero (86 GT 4spd) advice on my clutch, it seems to stop working. It has progressively gotten worse as in its been hard shifting, which made me think there is air in the line.Which im 99% sure there is but there still is problem still a problem. When the car is running and i try to put it into gear it doesnt grind it just wants to move the car forward. . My question is this, if my clutch has never slipped out of gear and still pulls hard under load, is my clutch fine and its just a hydraulic issue. I tried bleeding the system by myself, but then i was told about the power bleed. a couple mechanics that i talked to, who were somewhat shaddy anyway, told me that there is no way that there is hydraulic problem if there is still fluid in the reservoir. Anyway i just need some quick advice, i dont want replace my clutch obviously. One last question? is the slave in the back. thanks.