FORTH isn't for everyone, the use of Reverse Polish Notation, stack operations, and language extensibility can be daunting. But, between Starting Forth as a tutorial and this work providing conceptual insight, there is a path for self study that can bring you along to intermediate level with a reasonable investment of time. Add the FORTH Programmer's Handbook, the ANSI spec and a freeware FORTH package for your flavor of OS (including PalmOS, UNIX, WINDOWS, MSDOS, just about everything has a version) available via the net, and you've got everything you need to explore and learn this powerful, extensible, and compact language.