ok...if you are going to fix the rust - you should be looking a few steps ahead for what to look for or consider as you dig in. I combed through several build posts to see what to look for and to gather tips/advice from others who were going through the same repairs.
I found several times where I thought I was nearing the end and then had to order parts and wait (up to a few weeks) for the parts to arrive to get back to it. That was good every now and again just to break up the work into smaller chunks.
I flipped your pix so we can see the angle/view you are referencing. As noted the A pillar and the kick panel are the easier parts of the truck to fix...the B-pillar will need a coordinated effort where the sheet metal comes together as you lay on the ground trying to cut/bend/remove the rusty metal.
Have a look at my build post on an older project I did - a few pages in I started to document my progress with the rust repair.
http://67-72chevytrucks.com/vboard/s...d.php?t=341224