what you can do is square off the bad section as square as you can.measure from the floor making a mark just down from the bottom of hole and then use a a square make square lines up both sides put your top line across but make sure your side measurements are exact from bottom line or it will not be square then take a piesce of wood wide enough so you have at least 1/2 inch sticking behind where you would vut out your marks using a jig saw then plmeasure thre height of you opening cut a piece of wood at least 1 in higher then the opening so you have 1/2 in above and below top and bottom of cut out have at least about a 2 in wide board after you cut the board to height try to fit it even if you have to angle it but get it behind the drywall adn make sure there is about 1/2 in of the board sticking inwards toward center of the hole then on the outside of the hole fter you gewt the board in take drywall screws and put i a few,to hols the boards in place you should have about 1/2 in sticking on the inside of cut out BOTH SIDES then cut another piece exactly the size of your cut out and alont inside where the board comes in 1/2 in put drywall screws in there then take spackling or drywall compoiund a putty knife and put a tin coat around the seam and then sand the compound and paint it.make sre you try to take a ball pean hammer or any hammer and carefully tap thre drywall where your going to put screws this will sink thoses areas a little so when you put in the screws the scrw heads wont be flush and sticking out if you tap lightly and indent where your putting the screws it will sink it a little then the screw heads will be below the surface and you can tehn put spankling /compound over the screw heads and they wont be seen,but put the wood behind the drywall 1st a pull out slightly and keep pressure on the boards slightly outwards so that when you go to dent the dry wall you dont hit it and break a piece out of aroud the newly cut edges..Jim
