Need to know the year, make, model and engine size to help you with that one.
I have a 96 Camry and the drain plug is metric - I believe it is 14mm. You will need a socket or wrench of the appropriate metric size.
A wrench
15 mm
Why not just try different size metric sockets until you find the one that fits.
Remove sure, why not, but I wouldnt install it with an impact gun. If you need to use an impact gun you may have bigger problems.
You need a flat screwdriver to remove the belly pan. A 12mm hex socket/wrench to remove the oil plug. and an oil filter wrench to remove the oil filter if it is too tight.
i dont know exact size wrench but if you are having trouble making wrench fit, u need to use metric wrench
You can use a 11 centimeter socket to remove the transmission drain plug. The socket should be a five-point socket.
You will need a Torx style bit or wrench to fit into the plug (size T40). A small pipe wrench which grips the outer flange of the plug can also be used to loosen it.
From the sounds of this question, you are going to need more help than I can give. The plug is located at the bottom of the oil pan, and you need a wrench to remove it. Are'nt you even worried about the oil filter?
7mm Allen wrench
Remove the drain plug from the oil pan, and let the oil drain into a pan. Unscrew the filter from the side of the block, you may need a filter wrench to do this. Replace the filter with a new one, and put the drain plug back in. Fill the engine with fresh oil.