Timing belt change 2.0l CC does not get belts on

Hello all, now I finally removed the timing belt on my Megane 2 CC 2.0l. Everything went much better than I had already feared, but now I can’t go any further. See pictures. Don’t get the new timing belt on it. It would almost work if I finally mounted the tensioning roller, but then I didn’t get into locknut. Only because it really needed a muzzle with the new strap, so that the grooves sat everything exactly, the cam adjuster a bit. Until then I made good progress, even if it took a lot of time, because I’m doing this on the car for the first time. I hope you can help me. Thank you very much. Work rests now I thought I would get it all ready today, but Pustekuchen! And now I see that the holding tool from the front camshaft is something. So soon I guess the total chaos. I found nowhere also settings of OT 1. cylinder. The pinion of the camshaft is loose on it and also not not a notch also notch I had gone through the engine a dozen times and it was already difficult to fit the holding gear in both grooves. The car was commissioned 5 years ago in a Renault workshop with timing belts and everything. The car always ran perfectly round so far, no dropouts etc. Hopefully that is still something to save. At the moment I stand in front of the engine and ponder what to do. I really wanted to do and I knew it would take time, but now I’m paralyzed.