I downloaded Classic99 last night and started messing with Forth. Very interesting! Although I agree using a PC Editor to enter code and then copy/paste is probably a good way to go - I think in the beginning it's better to stick to interactive mode to get a feel for the language.
I suppose the hardest part of Forth for someone like myself with no experience is how you create a full application with it. I understand the need to "pay your dues" with learning how the stack works; but taking all of that and building an application that uses words, takes input, etc. is the baffling part to me right now. I'm sure in time it will come.