Clutch defective?

Hello this here should be my first post here and it starts right with a huge problem 😛 This morning I put a piece back to get better out of the parking space. Then the first gear. Feels funny. Now the second. Didn’t. Car pushed back. Now the gears go in, when the car is off so the gear is not running. When I ignite it shoots directly off… That would have to be a defective clutch or? But my problem is, how do I build the part What steps do I take at first? I don’t have a lift but very good bucks and a good jack. I also have many tools. Since I am a trained locksmith, I can handle it quite well and pragmatically. I would also like to light it ^^. My father also helps me, however, he hasn’t changed a clutch. I have to go back to work in Switzerland on the 30th. I have a vacation for so long. Please help me.