Here's a technique I developed quickly at the Care of Trees and still use today. When stacking branches, the most important one is the one on the bottom. Look for one that flairs out like a fan (or now that I am in CA, "like a palm frond"). Set that one down, then proceed to set others down on top of it. But don't just set them on top. Force then down so that the twigs get intertwined and lock together causing the pile to become one unit. Stack it to your desired size then you can often grab the butt end of the bottom fanned-out limb and just pull that, though in less perfect situations you'll need to grab more to keep things together.
I like to stack my piles to the size that I can toss the whole pile into the chipper. Bigger the chipper, the bigger the pile.
When I get to the chipper, if there is someone there already feeding it, set the stack down and go get more. When they are done, they can feed what you left. I've been on jobs and seen 4 or 5 guys all standing around the chipper while one guy struggles with a stuck piece of brush in the infeed chute. 4 guys waiting. Waste of time. I know it's best not to pick stuff up more than once, but waiting is worse.
Don't put one big pile near the chipper. Frans said to feather it out so that it can be separated. I like to just make many small piles that one person can walk to, pick up, and throw in the chipper, rather than sorting out a bigger pile and trying to grab the right amount.
That's it for now. I hated dragging brush when I started. I did all in my power to lessen its effect on me.
love
nick