great stuff,,easy aint it,,,lol,,,somtimes the best way to learn is by your mistakes....wich you will make over the coming years,,i still do today after 37 years....
with regard to the getting the collar on,,,,,best way is to allready have the strap through the buckle,,,then put the ferrets head in,,,then tighten,,,,also make sure you have enough holes,,if its a slender jill you will have to make extra holes,,,and not as far apart as those fitted to a standard deben collar....
another good tip is once the ferrets head is in the collar,,,pinch the skin at the back of her head,,,like pic