Quarter panels, let's cut em off and put new ones on.

I'm getting ready to do some major cutting on my 71 dart. I would like to know all the ins and out of cutting and welding new quarters.
Any and everything you can tell me would be great.

I can weld thin metal but I'm not a body guy and have never done a quarter, so let's hear what you did that helped and what you did that was wrong?

Thanks for all the time and advice.
Measure, measure, measure. then cut, measure and fit again. Take your time. Get some good clamps or Cleckos. I prefer cleckos. and get a quality panel flange tool. I went thru 3 Harbor Freight ones on just one panel..

Project 440DD