Since I’m not lucky enough to have access to a concrete mixer, I used to mix concrete in a wheelbarrow, which was fine — except I’d often end up with some dry mix in there, and using a rake or concrete hoe was tiring, and I’d always get splashed with the stuff. Then I discovered the CreteSheet.
The CreteSheet is basically a heavy-duty sheet of plastic with reinforced handles. Just add your mix, add the water, and then you and a partner take turns lifting your end up. You don’t need to lift it much, just enough to fold the lower part of the mix to the top. Do that for about a minute and you’re done.
The handles help you carry the load and will also form a pour spout that’s perfect for fence posts. When you’re finished just rinse it off with a hose, then either roll it up or hang it from a handle.
The CreteSheet sells for about $20.