Removing this ? (With pic)

DeVlaeminck Posts: 8,728
I'm changing the chainrings on this, I gave up doing maintenance on square taper so not sure exactly how much I need to take off but it appears the whole chainset.

I'm assuming I gave to remove the whole lot by undoing the non- drive side or...?

Or is there some kind of special tool fits into that silver ring in the pic with 10 indentations?

[Castle Donington Ladies FC - going up in '22]