So, might I suggest you consider buying an inexpensive electric 4-1/2 inch grinder like this one at Harbor Freight for $14.99.
Just a note for anyone reading this in the future, the company that sold our metal roofing said that using a grinder to cut it would invalidate their warranty and recommended the shears I've posted.
I'm only 5'3", don't need it 6' tall.
Beware. Bedding builds up and stuff hangs down.
https://www.backyardchickens.com/th...a-full-height-coop-run.1484191/#post-24739887
A short coop and a cuphook cost me an ER bill for 10 staples in my scalp.
I know DeWalt makes the DEWALT Metal Shears Attachment, Impact Ready for drills. I imagine that would work. But it costs about $60.00. Might be the perfect attachment for someone, but I still prefer the 4-1/2 inch grinder which would be more versatile and could be used for many other jobs. Understand you probably don't want or need a grinder, but I just use my grinder so much that it's a tool I can recommend. I have not used this attachment, but I hear good reviews about it.
Again, just because people will read this thread in the future, it's important not to get the sort of shears that take a kerf out of the cut and leave bits of metal behind.
I'm not familiar with that attachment so I don't know if it takes a kerf or not.
Good point about the weight - yeah those things can be heavy. I use a utility dolly or hand truck to transport the boxes to the back yard, then lay them in the yard and push to unroll across the ground the lengths I need. I never actually pick up the boxes, I walk them on end onto the dolly, then push the dolly.
I use teenage sons to haul the wire and just roll it across the lawn after that.