If you haven't done least time in chamber 14 yet, it's all about how fast you can accomplish your method.
I just did the "ninja technique" (placing a portal on the floor right next to the victory lift, second portal on ceiling, fall through first portal and place second portal on way down) over and over until I made it.
I would not rule out using youtube as a guide, especially when going for Aperture Science. The developers knew a lot of the tricks you can pull off and didn't hesitate to make the challenges brutal by requiring use of these tricks.
I hope this helps, happy testing!