Manual Trans issue

It has been a while since I've been on here but having two little kids will do that. Anyway, I was driving to work and needed to downshift to fourth and it would not go into gear. I had to come to an almost complete stop before I was able to get it in gear. Shifting up was ok at this point and I continued to work. Once I got to work I tried to back into my spot and it would not go into reverse. Later that day, I tried it again and with the engine running I could not get into any gear. I put it in gear then started the engine and I could take off but it would shake a lot. Any ideas? I am guessing my throwout bearing is shot. I have 215k miles and I have no idea when or if the clutch was ever changed.

Sorry so long but I wanted to put out as much info as I could remember. I am planning to order a LUK clutch kit with a flywheel and install it.

Thanks in advance.