When we need to mix 60-lb. bags of ready-mix concrete, we make it easy on ourselves with the following procedure. We begin with a 5-gal. joint-compound bucket with about 3 in. of water in it (it’s easier to mix concrete if you put the water in first). Then we get out the 1/2-in. drill and chuck in a blade mixer with a shaft that’s about 30 in. long. While one person runs the drill, the other person slowly pours the dry mix into the bucket.
With a little experimenting, we can normally get our water/aggregate mix close to perfect without having to add water or dry mix to the batch. Using this method, it takes us about 90 seconds to mix a sack of concrete.
—Bob Brereton, St. Paul, MN
Edited and illustrated by Charles Miller
From Fine Homebuilding #120
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You need one more person to hold the bucket...
The drill operator can hold the bucket between their legs, no? Okay, maybe a 3rd person if you're working for the govt.
Or you could use the tip here:
https://www.finehomebuilding.com/2010/01/21/mixing-bucket-grip
Or...
The last time I was at a construction conference sponsored by a magazine which shall remain nameless, I asked an experienced tile setter (and thinset mixer) how to keep the bucket from spinning. He looked at me like... well, never mind... and suggested I just put one foot on the rim of the bucket.
I do think that the tip Sam cited would be worthwhile for mixing more than a few bags.