ok.. get all 3 of yer 5g buckets ready and set under the tractor.. pull the drain plug.. drop the plug in the 2nd bucket while it is about 3/4 full.. plunge yer arm in frantically looking for the plug.. as the bucket gets to 99.999% full, jab yer thumb from your free arm up into the drain plug hole and (mostly) stop the oil flow... don't worry about the few ounces running down yer arm and into yer shirt.. oil is good for dry skin!
by now you've had time to find that plug.. but the delima.. that 5g bucket is now almost too heavy to move with one hand while the other is plugging the oil drain... so carefully scoot the bucket over to get the last one in place.. yuse yer legs to help. yeah.. you spill about a half gallon as the bucket scoots over.. now you let the rest drain into t he last pail.. you probably only get another pint or two down yer arm and shirt as you pull yer thumb outta the hole.
bingo! oil drained.
er.. at least that is how I did it the first time on my NH 7610s
best of luck!
soundguy