Floor pan and quarter patch help needed.

Guys, I'm going to be replacing the floor pan in my 74' Duster. Have any of you guys done this task? and if so any tips on what to expect or any issues I may run in to? I assume it's not going to be easy but help would be appreciated. Next I am going to be replacing the very lower L & R quarter skins, any removal/installation advice or issues I need to be aware of? besides the general head scratching and tool throwing?

Thanks guys