Well, I'll take a stab at it, and await the multiple corrections which will follow.
I do it this way....
Start it.
Let it fully warm up at some low-throttle setting, couple clicks off high idle.... at least a full minute, maybe more.
Advance to full throttle. Should come up smoothly, and stay solid at the high end.
Pull down to normal idle, let it sit. If it slows, it's rich. If it speeds, it's lean. You may have to leave it there 30 seconds or so to be sure, particularly the closer you get to "optimum".

Let's say it's rich.
Shut it down. Adjust 1/8th turn CW on the L needle. Start it up.
Warm it up. Go full throttle, back to idle, let it sit. Repeat previous checking for slowing or speeding.
If still rich, shut off, adjust leaner, restart, try again.

Do this until you have a solid idle, and no hesitation as it comes up to full throttle. If it sags when rapidly advancing, it's too lean.

High end - start at factory setting, about 1 1/2 open from fully closed. It will likely be rich.
Just like the low end, shut it down, tweak it, restart, warm it up, check again.
ON the HIGH speed needle you want "peak".... and go easy on the needle, the closer you get. You will get to a point where you will go a screwdriver blades' thickness of change.... and go easy with those....

Fly it.
If it sags in a full power vertical, assuming you have good cooling, proper prop, and good oil ratio, it's lean, and you need to land, richen a screwdriver thickness, try again.

When you go through this a couple times, it will become easy for you to know where to start.
And the DL adjustments on my engines have been VERY stable, hardly ever needing changing after about the 3rd gallon.