If you have never done this before, you can easily make a big mess if you aren't careful.... I would suggest a good Siphoning Pump(Found at any Auto Parts/Hardware/Pet Supply Store) placed down the Trans Dipstick/Filler tube...

It's a 6ft Total Hose, but just check it will fit down the tube, or you may need a smalled Diameter Hose(Make sure it is Oil Resistant) found at any well stocked Hardware Store....
A Rinsed Out Plastic Gallon Milk Jug will make a decent fluid carrier, so long as the fluid is not hot....