Appologies, i did get a bit ahead of myself there... This is for an fc btw.
On the gearbox there are 4 plugs, 2 on the side and 2 on the bottom. The 2 on the bottom are drain plugs, one of the side ones is for the filling point and the other side one is for the check hole. Start by removing the two on the side, then with a container at the ready remove the bottom two. Once the old oil is out use some sealant on the bottom two plugs and replace them. If i remember right there\'s a crush washer on the larger drain plug, this should be replaced aswell. Now comes the bit i mentioned before with the length of hose and assistant etc. Place the hose in the hole on the side of the box which is closest to the engine then start filling it up. When the oil starts to drip out of the other hole its full. Replace the two plugs you have left using more sealant and thats it. It took nearly 3 quarts to fill but i did spill a little.