Dont try to reball without proper equipment, it is a lost endeavor. You need a jig and stencils in order to reball a chip. Unless you have an achi rework machine or better don't even try it. I reball only last resort and with a new chip. Normally the resident chip will not withstand the heat.
I'm curious to know what equipment you have?
I'm not trying to be a downer I've got some of the best equipment and I've learned from experience the best techniques and unless you have top of the line everything it can be a real bitch...solder balls have to be the best use Chemwick for desoldering etc..