Wewild,
Acutally I used the spear in the flat side of the bale and just set the 1st layer down at an angle and let it fall over. The second layer I did the same way but let the leading lower edge just touch the top of the bale on the 1st layer, I then let it fall into the 1st layer. The first time it tried to put a bale on another it must have took me 4 or 5 tries to get it up there. Now after the first few bales, it gets easy. As the old saying goes practice makes perfect.
To get the top layer down, I can reach up with my spear and drag it off.
In years past I have stacked bales in the barn using the round side. I would stack 3 layers and hated it because of the weight the bales would settle. Later when you took the bales out, they would be a malformed from the settling.
By stacking the way I do but laying on the flat side, the bales look as good a year later as they did the day you put them in the barn.
I know this sounds dumb, but I sell most of my excess hay to the "horse folks" and they like it better if the round bales are round.