The best thing I've done is watch a video on making a reddit clone in Lisp. I couldn't get the libraries to work, but I plan on using other libraries to do the same thing either tomorrow or the next day. It's made me realize that I really need to start walking through other people's code. https://vimeo.com/138249727
Google's LISP koans which is ~30 exercises where you complete the code and make the tests pass. Covers everything from mapcar to multi-threading. https://github.com/google/lisp-koans
I'm currently on Ch. 9/32 of Peter Seigel's "Practical Common Lisp". I find the book to be a much better resource after already being familiar with the topics covered. It does a great job of going into the nuances and gotchas of the language, but because is so much more text than code, it's hard for me to appreciate all of those little details if I'm still trying to grasp the fundamentals of the topic. http://www.gigamonkeys.com/book/
I write all the code I see with a pencil and paper (including all of those koans). I read a block of code and then try to rewrite it from memory.
Currently using vim. Haven't gotten around yet to using a live environment.
Future resources:
Paul Graham's "Roots of Lisp"
Paul Graham's "On Lisp"
Build a Lisp compiler
SICP
Paradigms of Artificial Intelligence Programming
Upgrade my editor