As advice to everyone, just know that doing this level of woodworking (large pieces) means your materials are
heavy. They are, after all, logs.
Heavy wood needs heavy lifting, or being suspending by some sort of hoist, or lifted by some device. This is hard work, and it seems to get exponentially harder after a certain diameter/weight.
The advice is, be careful. Expect this aspect, plan for it and proceed with care. You're shifting heavy wood and slinging a chainsaw. Physical activity really doesn't get a whole lot more raw than that.
Use any advantage that you can.
Here's a picture of a medium-size log arch, called the fetching arch. This arch had both tongs AND a winch system and man, it was versatile, you could maneuver it easily just alone, it did amazing and quick lifting tasks and it spurred me to try an large number of projects like what we're talking about in this thread. You could tow it down the street. I'm so sorry I sold it as it (looking back) was a key tool for whisking 800 pound logs around and doing this stuff, especially mulch pits (more on that in a moment).
If you're gonna do this stuff, you have to move the log from place A to place B, and then shift and position and fit it, which means moving the log. If you have two people, one will spend 95% of the time standing and watching you, staying clear of the chainsaw. I rarely
want another person around, this is a creative process.
The point of this post is, wood heavy - arch lift - arch good.
Or SOMETHING to help you move heavy wood around, a dolly at minimum. ball cart or bale cart more preferable.
I created a heavy-duty cart to haul big chunks, or support the far end of a really long log in teaming up with the arch. Mostly to move piles of brush, multiple smaller logs, firewood or all my gear. Here in this picture, I fell in love with this log. In cutting it up there was a deep, chocolate brown, mmmmm, It was Russian Olive. Even though the log is short and contorted, I really wanted to mill this log. I could feel it with this piece, and it was a brute to get out of the sloping back yard, and then getting home with it.
You really have to think about logistics, or a single step in the project can eat your day.