Folks, I have been lurking for years, watching all the fabulous DIY on various streams ... thought to meself, I could give that a go ... and discovered that, in Dublin, walls are solid. So, the electric drill doesn't do what is necessary (as in I have 2mm to 5mm deep holes fecken everywhere in me gaff) ... All & every piece of advice would be appreciated. No banana for scale I'm afraid, you'll have to work out just how "deep" those measurements are please