Ezflip, it takes you 3 hours to jack up a car? LOL.
I think it really comes down to how much you have done in the past. If you have a lot of experience and lots of tools/resources at your disposal you could probably do it in this manner. It was my first job like this that I had ever done so I followed all of the instructions to the letter and that is why I did things the way that I did.
It is not a competition to see how quickly you can complete the project. Do it right and take your time. Your life may depend on it. I have 5 mouths to feed at home so I didn't take chances going outside the box.