ITW Foam Injection

[B F]

Hey all, I've been a longtime lurker on the list.  I usually just find
answers through the archives, but this question seems kinda unique.  I don't
know how many of you have any experience with injecting foam into the
chassis, but maybe someone can help me out.  I've got 5 kits of ITW's
Autoseal product, and I plan on beginning to apply it within the next few
days.  I've read the instructions on the box, Kojima's article in SCC, and
anything else I can find, but I'm still not completely confident about
proceeding.  If anyone has any hints or suggestions I'd love to hear them.
I'm particularly interested in possible prep-work, specific parts of the
chassis to foam, and how much to apply.  Also, I want to make sure that I'm
not doing anything that could have serious detrimental effects.  I've done
tons of other work on my car, but this job has gotten me nervous.

Thanks for all the help you guys provide.