HTML 3 & Transition to FB 2.0.1

I have FB 2 installed and working with a number of forms. One of them was a bugger to get working as it emails to a recordset, with an attached file, and uploads/inserts that file into a database. Jason helped me with it and frankly I'm afraid to touch it now that it's working.

Except that I want to add html to the form and modify the layout/design by making the form itself larger and also some of the form fields. In looking at downloading the HTML 3.0.1 editor, it says to download FB 2.0.1 first. So I'm seeking advice on the best way to approach this.

1) Do I need to uninstall FB 2 prior to installing FB 2.0.1?
2) Will installing FB 2.0.1 require updating or altering my current forms?
3) If I edit the design & layout of my form (using Edit Form/Edit Contents/Edit Design buttons) will that alter the code having to do with emailing the recordset, uploading/inserting file into db? Specifically, I believe what Jason helped in getting tweaked had to do with the order that code appeared on the page, although it was about six months ago so I'm not sure that was all there was to it.
4) Once I upgrade to FB 2.0.1 and install the HTML editor, can I just add HTML editing to my form without overwriting any of the code that emails and uploads/inserts file?

Sorry if I sound paranoid, I just want to know if I'm opening a can of worms as the form does work now, and this is really only needed because I'd like to change the layout design of the form and add HTML editing to it.

Thank you for any advice on how to best approach this.