Hopefully it won't be long before I finally have cruise control!
I'm happy to report a successful cruise control installation! I connected the wiring yesterday and have already had a couple of test drives with it -- the cruise is working beautifully!
I will say that the engine-compartment part of the installation was the 'easy' part -- though it's a fairly easy project, overall. Installing the T-tap connector for the power wire was the trickiest part, as the back of the junction box is hard to access (might be easier for younger, more flexible people, lol). I used a large hand mirror and a camping lantern, and that made it much easier to find the correct wire and tap into it.
Another thing that made the installation simpler was that I had removed almost the whole cruise control system from the donor car, so I already knew how it should be laid out and where everything should go.
Happy to be checking off the 'cruise control' item on my list! And I must say, I'm really proud of all the little changes I've made to this car, as I'm just a hobbyist and have no automotive training at all! I appreciate all the knowledge and advice I've gained from this forum, and look forward to contributing as best I can!