Thanks, I’ll try drilling it today. The plastering aspect I’m happy to pay someone to do well. Also we need the fireplace and area around the new windows plastered so we’ll do it all at once.
Hopefully, this is simple. I want to square off the arch that separates my living and dining rooms. I have highlighted the area below that I want to remove. Being very new to DIY I planned to just chip away at the brick/concrete (which I'm assuming it's constructed of) and then put plasterboard...