Hard to get into gear, hard to get out of gear or both? You gotta' give a litttle more info/ description of the
problems(s). How many miles on the car? Sounds like your synchros are shot. I had same problem last year. Had tranny rebuilt for a little over $1200. Replaced synchros, bearings, one shift fork, spider gears and had flywheel cut for that price. (I supplied new clutch.) Junkyard trannies are a crap shoot. You probably won't be able to know the actual milage, and even if low miles, you can't see inside to see what shape its in.
If you do get your trans rebuilt,(IMHO, the best option), make sure they check the spider gears. They are a weak point in the MTX75 transmission,especially if you drive in a "sprited" manner!
Mine where just about to come apart. If they blow while you're driving, the bits and pieces can wreak major havoc to the other parts inside.