Do we need to have TWO autoresponders?

Do we need to have TWO autoresponders? One for people while they are saving/filling out, and one when they are done (that attaches the PDF of the final submission data?)

You don't need to create additional Autoresponer.

If you want an instant, pre-written reply or you want the submitters to get a copy of the data submitted they have submitted to your form. You can also edit the submission as you see below:

I also suggest you to check guide for more information:

http://www.jotform.com/help/26-Creating-a-Form-Autoresponder

If you have any question or issues, please do not hesitate contacting us. We will be happy to assist you.

So then to send an autoresponder at the end, I just use the normal
autoresponder and leave this box unchecked?
"Send on editing submission:"
Is that correct?
thx
...

So then to send an autoresponder at the end, I just use the normal
autoresponder and leave this box unchecked?
"Send on editing submission:"
Is that correct?
thx
...

Your assumption is correct, you can leave the box unchecked. However, if you would include the edit link in your Autoresponder, you could check that option if you want to, so the Autoresponder gets send again with the updated data.

Please open a new thread if you need anything else, we will be glad to assist you.