well if your lucky,and find a realy nice happy glaiser,theyd probly cut it for you for nothing...
but having said that,first you need to find one :lol:
its realy easy to cut glass,all it takes is practice and patience,well probly a few other things too, but practice makes perfect.
remember to use a "straight" straight edge, an oiled cutter,and a flat surface like carpet to cut on.
run the cutter along the cut to lubricate it a couple of times,
and then start at the top edge, just so that the cutting wheel is just over the edge of the glass,apply pressure and draw back maintaining pressure over glass to the oppisite edge.
to break slip a small pencil under edge of cut and apply even downwards pressure on both sides of the cut,errice(sp)edges and there you have it a fresh cut piece of glass.
hope this is helpful...
Tim