I think "learning Lisp" is Arc's best niche. So yes, try using it and come ask us questions. Feel free to also ping me over email, that is sometimes faster. My address is in my profile.
One caveat: it can be easier to learn from a book if you follow the language it was written for. Land of Lisp is a fine book by all accounts, so if you use it you may be better off just using Common Lisp or whatever. But feel free to come ask questions anyway. Maybe we can show you both Common Lisp and Arc versions of programs.