> Metal snips
> Is that what you Brits call scissors
I'm American and that's just what the tool is called. Aviation Snips. Tin Snips. Metal Snips, or just plain Snips.
Tin snips are super easy
Stanley FatMax 14-563 9-7/8-Inch Straight Cut Aviation Snip https://www.amazon.com/dp/B00009OYFY/ref=cm_sw_r_cp_apa_i_h0DgBb92A5TRF
Perhaps https://www.amazon.com/gp/product/B00009OYFY can help? :)