Oh for chris sake just put blades stright out up and down the body/boom this will set the fly bars at 90 deg to the body and slide a finger under each side of the fly bar and pick it up! Its not a big thing and it actually does NOT have to be perfect. All you want to see is it hang pretty much level or a little nose down and NO the fly bar paddels do not really have to be level as they don't really affect the balance. Heck if you want you can even loop a string around the head pretty much any old way and pick it up as long as the blades are opened up, also if you do it with the string it does not make any diff if the blades are fore/aft or sideways as they are on the same moment in suspension in relation to the head and center axis. Usually you adjust the fore-aft balance buy sliding the battery forward (if you need to add a balsa plywood extension to the battery tray so you can at least velcro the battery in place) Don't even worry about the right and left lean on it as you will trim that out with the swash links first time you fly it.

Blade balancing is done with a gram scale and a ruler. There are many threads on that its quck and easy. You don't even need a fancy scale only something you can lay the blade over so you can balance it like a teeter totter. Never mind trying to balance the entire head on a king as the parts are so close to the center of axis you really will end out rebalancing the blades to balance the head. A king has much too small and light a head to worry about trying to balance a 3 gram plastic blade holder part when your parts on the head only very by .1 gram. Worry about the 142 gram (blade weights very from one blade to another) blade being 2 grams heavier then the opposing blade or not balancing at the same point along it's length.