Success! Thanks again for the advice.
Am writing this on a newly-upgraded, mid-2010, MacBook Pro 15" with 8GB of memory and a 1TB SSD. (Courtesy of our sponsor.) The difference in speed is noteworthy. I'm not sure why I did not opt for 16GB of memory when I place the order.
What follows is lengthy. Before I get started I'd like to share some experience that may help someone. I also ordered an external case for the SSD, thinking it might come in handy. It did, as I ended up cloning the spinning hard drive from this MBP to the new SSD. The tip is: you need to push the SSD into the pins a lot harder than you first might think. I thought I had properly seated the SSD into the case, but it wasn't actually all the way in. It took quite an aggressive push to get the drive fully nestled. I found this out when I couldn't close the case properly until I actually did seat the drive in all the way.
OWC's video explained the procedure quite well. I was interrupted by a delivery that necessitated meeting the driver in the rain, so can't give an accurate account of how long it took. I would say a bit under thirty minutes. However, I forgot to prep the air blower until I had opened the case, so finding that also added some time.
More frustrating than the actual installation was prepping the SSD. My attempt to create a bootable thumb drive that was plugged into the spinning-driver version of this laptop from Apple's web site failed. Numerous updates showing a remaining time of 13 minutes dragged on for hours. I still don't have a bootable thumb drive.
My next strategy was to use the USB 3 ports on a newish Mac Mini to clone the new SSD from an SSD that was pulled from an old iMac. The cloned SSD could not boot the MacBook Pro as an external drive. It turns out, the SSD from the iMac also could not act as the start-up drive for this laptop. I'm assuming the iMac's OS was too new for this laptop, but don't really know.
The third—and final—strategy was to clone the hard drive of this laptop to the new SSD. The newly-cloned SSD successfully booted as an external, so I finally felt comfortable swapping out the drives and memory.
The old, spinning drive in this laptop was, itself, a six-week-old clone of a MacBook Air. While I would rather have this laptop be a clone of the iMac, I can live with a clone of the MBA. Now I need to deal with adding Adobe and other software. I'm pretty sure I have the original discs somewhere, so anticipate only minor problems.
Thanks again for the feedback and support,
Todd's older/newer, speedier keyboard