Welding on your head

I've gotten pretty good with my OA welds; I spent the last three
months practicing a splice by inner sleeve and am pleased that after
much practice I can melt the three components together and get good
penetration. On the bench.

However, when I tried welding on the fuselage, it's an entirely
diffferent situation. Just like they don't tell you that 95% of the
effort is jigging things into position, they don't tell you the other
95% is positioning the work so that you can work comfortably.

On the bench, everything is timed and measured and meticulous; if I'm
welding from the side, things get tense.

Am I correct that this is going to turn into weld-a-little,t urn the
work .weld-a-little, turn the work?

Can someone share any hints on how to support your forearm? - Mike