Pay attention to the wind as well.
There are many things to learn about using and downing trees with anything. Not just chainsaw. I’ve probably come closer to losing a toe with a axe than a chainsaw.
Honestly I think it is a good practice to have someone with you no matter how much experience you have. I know people who have lost their lives trimming limbs off a tree when it rolled and pinned them. They were alone and probably still alive but couldn’t get free. Another person could have saved them.
Before you drop a tree you have to study it.
Is it leaning?
Does it have heavy branches hanging from one side.
Never underestimate the wind. Just a little breeze can completely change how a tree will fall.
If it’s leaning one way and the wind is blowing the other. Let it stand until the wind is in your favor.
That all goes for anything you use to drop it.
Also once it is safely on the ground it is not without treat.
Be careful when removing limbs that tree doesn’t roll onto you.
Try to anticipate what will happen as you cut limbs.
Should you cut from top down? Or bottom up. Usually one of the two is better. One will pinch the saw making it tight in the tree.
Keep whatever tool you use sharp.
Don’t cut into dirt and stones.
Wear proper clothing.
As Eric said don’t daydream.
Always remember and be aware of where your helper is. Don’t accidentally injure them.
Bjrogg
PS sometimes I take for granted how many things I have learned over my lifetime that others never have the opportunity to even experience.
I’m pretty sure if you find someone who makes a lot of firewood and give them some help. They will probably teach you a lot.