I should be using my 36" mill, with a 36" bar and the Flying Tiger 660 tomorrow on some large Red Oak.
I used a similar one with good success with a 24" bar on Hickory.
My comments on the video above:
1) I always use wedges, first in the end and when I'm almost done I put two in as close to the bar as possible, so when the saw breaks through the wood lifts the saw up (see saw action).
2) After you have a flat surface, you don't need the ladder or other guide. Just be careful that you are level when you start the chain into the wood.