hard to get into reverse means that it grinds? or that it takes a lot of force?
if it grinds, even after shifting into a forward gear, that tells you that the clutch is not disengaging fully.
if it takes a lot of force, after shifting into a forward gear, that suggests that the input shaft does not roll over easily. the most common cause for that is a bad bearing (which sucks because replacement bearings are unobtainium).
if it takes a lot of force, what happens if you push in the clutch and shift immediately into reverse? does it grind? or is it just high force?
I had one trans that got so bad I had to be moving the shifter into the gear as I started to push in the clutch, or else I could not get it engaged. one of the bearings had a little spalling on the rollers was all, but it made the trans un-usable.