Just so we are all on the same page. When you say you put the clutch in it
will move. Do you mean when you let off the clutch/brake pedal?
If you have not done already I would find the chassis manual for
your tractor in the manual sections of this site.
You will find how to set the the brake/clutch pedal travel in there.
Among a pile of info you will want for your project. I would start
with that setting and at least eliminate that possibility.
Enjoy the tasks, that is the most important part. You will soon be
a better mechanic then you think you are.
Ken