I have an my 125 and used it it dig two trenches, 100' long, 2+ feet wide, and 5' deep. Set the tractor up for digging (like you have it in your pics in the other post) when you have dug as close as you can coming towards the tractor, lift your stabilizers just to clear the ground a couple of inches, lift the loader up just a bit, put the range selector into neutral. Then set the dipper stick and the bucket teeth pointing straight down, lower the boom so the bucket digs in the bottom of the trench, then move the dipper stick away from the tractor. It will push the tractor straight ahead. Repeat as necessary.
I also used the boom/dipper to shift the tractor side to side so that I could dig the trench wider. I hope I explained the procedure well enough for you to try. You will get better moving like this as you get used to doing it. Good luck! Great little workhorse.