I second this recommendation. I'm a big fan of Grant's material. Some of it blurs the line between actual, technical "sales advice" and a more generic sort of almost "self help" kind of thing, but I have found it valuable in either case.
In addition to Sell or Be Sold and The 10x Rule, I'd also suggest Be Obsessed or Be Average.
I third that recommendation. Grant Cardones stuff is great for sales mindset. Less about the nuts and bolts and more about addressing underlying beliefs that are holding you back from selling.
In addition to Sell or Be Sold and The 10x Rule, I'd also suggest Be Obsessed or Be Average.