Having never played around with bars other then the default one (I tried, just never got them to work), I think my only questions are these:

1.) If I install a bar mod and set it up, do I need to drag off all the spells from the default Blizzard UI bars before I install and hide my old default bars?

2.) If I don't need to drag off the old spells, do I need to unbind all the bindings I currently have for the default bars? (i.e. the normal 1-= and any custom binding I have like Num0 for Lower Right #12)

I think not doing those things may have been what has messed me up in the past, but I don't want to drag everything off and unbind everything if this isn't going to work the way I want.

Thanks!