It's awful when you feel so worn out by it all Lise,believe me we've all had times where you just are flat and uninspired by it all,but i'm confident that with some of the suggestions things will improve for you,evn if you can maybe get to spend an entire morning monitoring them and placing them in trays as and when,and as much as you can after you've started it's usually not long after before they're doing it for themselves,forgot to ask and i know their using the trays sometimes but maybe put a smaller,flatter tray like an old Cracker tray with some soft paper litter in it,then if it works better for them as they get older etc gradually put some of the stuff you use now in it,as even though they're using the trays it may be that it's too much like hard work for them