Pear log split in half with an electric chainsaw. Log was layed on it's side, and cut in half in 4 steps...
The one log half was cut in 2 pieces.
I have a bunch of "circles" that I can choose from as a circle template... some are backing plates, others are sanding discs, some are just blank circles of different diameter. I choose the biggest one that'll fit on the log, as shown next.
Here's the circle template screwed onto the bark side of the log chunk.
Using the template to cut a circle from the log chunk
Here's the completed circle cut from the log.
Here's the blank mounted to a face plate, ready to be rolled by hand to check balance. Then I turn the lathe on at the slowest speed for a brief second to see if all's well... If not, I'll remount the blank and try again.
Slowly start rounding the blank with a bowl gouge...
Now that the blank is rounded and balanced and is running smoothly, I pick up the speed and start shaping the bowl.
Here I've started shaping the bowl and have started forming the dovetail shaped tenon that'll be inserted into my Nova chuck....
Here's the completed dovetail tenon. I use the bowl gouge to get it close, then I switch to a V shaped scraper, then finally a skew to get the tenon flat and at the right "dovetail" angle
OK... face plate has been rmoved, and the bowl blank has been chucked into the Nova...
Starting to hollow it out.....

(look Ma, only 1 hand!)
As the bowl get hollower, I switch to a bowl rest and finish hollowing it out....
I didn't have a brown paper bag handy, so I stuffed the bowl into a plastic bag with a bunch of it;s own shavings and set it aside to dry for a month or two....