Thanks, yes started reading through PCL last night, as it's online, and it's already cleared so much up for me. I'd never really thought about learning CL first until this thread, but now it feels like I've found the missing piece. And PCL is pitched exactly right, for me.
[1]: https://portacle.github.io/
[2]: http://www.gigamonkeys.com/book/
[3]: https://www.cs.cmu.edu/~dst/LispBook/index.html