Sallust's style, I feel, should be placed towards the top ofthe hierarchy of Latin prose difficulty. His vocabulary is of standard breadth but his active engagement in producing purposefully jarring, awkard and dissonant syntax deservedly earned him the title of the 'Thucydides of Latin'. Indeed, it is of no surprise that he was the key role model for Tacitus' contorted prose. All in all, it is the fantastic insight of Sallustian bitterness and his against-the-grain outlook that makes his Latin so fascinating and challenging a read. So go for it!