who told you you were doing it all wrong? i would ask that person---so what is right?
i've done many many quilts top to bottom- if the design i'm doing in the borders allow me to flow from top to bottom i do- if i need to turn the quilt to get the design right i do- i do my borders last- i stablize the quilt- generally quilt the (body) then the borders- roll to next section- stablize- quilt- borders- continue---to the bottom- if i need to turn it to accomplish my border design the rest of the quilt is all quilted & i unload- turn - load do border- unload- turn load- do border---generally only necessary for the 2 sides- generally i choose something i can do without having to turn the quilt.
do what works for you- don't worry about some (self-appointed quilt police officer ) who has determined that's (not her method so must be wrong) if we all did everything exactly the same way what would be the point of doing it at all?