it can be a pain but the way we did it worked pretty well. There is a scale next to where the hay is kept and we took those big round buckets and stuffed 4# into each one, took them outside the barn and stacked the buckets, put the hose in and filled them and dumped a cinder block in the top one.

It was amazing to see the hay after it has been soaking, when you pour off the water it looks like light beer.