I used to have a Singer 241. Not quite as sophisticated as your Consew. But I had a hard time adjusting to using this machine because of the type of motor. The motor was external to the machine and I think I needed a "clutch" motor. The motor would either be on at full speed or not running at all. I also found that the type of thread I was using made a difference. It also mattered what position the thread spool was in. It had to be upright and go through an eyelet above the sppol then to the machine. It was very particular. Once I had it working, if I had to change thread, I used the tie a knot to link the old and new thread and then pull it through.
You might try this strategy. Get a friend to help you. Ask your friend to thread the machine as you read the instructions, step-by-step. I find that this strategy works for me because it forces me to think differently when I become "teacher" instead of "student".
Good luck! Let us know when you figure it out!