Thank you for you replies, that makes sense now. What I ended up doing is just using a Submit button, making it submit as a PDF, put the Submit to URL as a mailto address and then once the form PDF was saved within Designer, I edited it with Acrobat and made sure Adobe Reader had rights to be able to save filled forms. Thus now when I or anyone opens the fillable PDF form with Adobe Reader, they can save it or once they click on the submit button, it pops up their default email client compose mail screen with the filled PDF attached and whatnot. This seems easiest to me and works well enough.
I'll definitely keep a record of you responses in case I need to change this later though. 🙂 Thanks!