I fully accept and understand the frustration of a GWIT puzzle. I hate them. maybe I got lucky here, I don't know.
I googled a list of 7ds. That got me the 'several techniques' within seconds, and I verified the first names within a couple of minutes.
It seemed clear to me given the instruction that one of these was the K****** for the other two. Surely that is a very small leap to make given the message? And as soon as you have one of the several techniques, the last two steps are obvious, even without being able to figure out the 29d.