So I took it to the dealer for a diagnosis. They said that the transmission fluid pan gasket, solenoid pack(?), and oil pan gasket were all leaking; the former two transmission fluid, the latter, oil. Repairs would set me back $1000+. Oh, and while they had the car up, they checked the brakes. The pads were paper thin, same with the rotors. Another $350 or so would get that straightened out.
Or, I could change the gaskets and brakes myself and save about $900. (No parts store that I called had the solenoids, and the one former mechanic I talked to said that it'd be a job I really couldn't--or wouldn't want to--do myself.) So I got the parts, (about $250, including a new hydraulic jack--those puny scissor jacks for changing spare tires scare me!) and a Haynes manual (if I have to take something off unexpectedly, I'd like to know what I'm getting into first!) and I'll get started on it this week!
Kara asked me if I'd changed gaskets before. (She knew I'd done brake pads and rotors, several times.) I told her that I hadn't, and that that hadn't ever stopped me before. Plumbing, tiling, felling trees, building furniture, making sourdough bread, knitting...all in the "I might as well give it a shot" category. And although I have called a knowledgeable friend a time or two, I've never had to pay a pro to help me out, knock on wood.
Wish me luck.