I was driving lastweek when I noticed it was.

I was driving lastweek when I noticed it was hard to put gear into 1st 2nd 3rd 4th gear, everytime I stoppped or slow down at the lights I struggled getting to 1st gear. 2 days later I couldnt evern push the clutch down it was so stiff that I couldnt get into any gear also had to turn the car off and on (engine) to change gears from reverse to 1st so I could park the park please help. I dont know what to do I went to the mechanics but they are quoting me $4000 to fix it would you give me an idea of what it could be so I DIY at home and save instead of splahing so much at the garage