That was the only one I didn't finish!Just don't pick up The Last Continent. That was the only Discworld book I didn't like.
I'd start ether at the beginning or with ‘Reaper Man.' if you don't like that one, then you won't like Diskworld in general IMO.
I bought and read them all ,in order, at release time, as they were published… yes I know, I’m old.
That was the only one I didn't finish!
I keep meaning to read it through some time though, just to see (decipher) what the whole story was.