There's a legend amount this post, but that's yourself Martin
Yeah you got it, purchase the LED bulbs and the conversion harnesses (maybe cheaper elsewhere just got the link quckly) and your good to go.
The little boxes in the kit arnt heavy, would guess around 50g each. I only did a quick install at the weekend as thought I was just testing fitment as thought I would need resistor, but didn't so I just used the trusted cable tie to the horn bracket on either side, but there a bit of cable so with a but more time / effort could be located somewhere tidier