I want to replace my floorboards

[clay69camaro]

Does anyone have any pics and advice they can give me. I have a drill, some air tools, a cut off wheel, a lincoln mig welder. I've been doing patch jobs but the rust is cancerous so I want to just do a whole floor replacement.

The car is sitting on jack stands without a front sub-frame. Will I need to brace the entire body, or is cutting out the old out and putting the new back in a simple enough task?

Thank you in advance everyone.