On the plus side (ha), you only want to lose 10 pounds and consider that your “ideal weight”, and also mention that you gained this 10 pounds over the winter, which implies that you were at this ideal weight not long ago. It’s much easier to get back into the kind of shape you used to be in than it is to get into “the best shape of one’s life”, and the more recently you were in that shape, the easier.
Your six-month timeline, generally good eating habits and relatively modest fat loss goal are also good indicators for your success. (Though I would say “low meat consumption” is not necessarily a plus, unless you mean “compared to the average American who eats 1 lb. of red meat or more a day”).
Your best long term solution is to change your mindset regarding one of these statements of yours from the OP:
I’ve never been a dieter – I feel it’s better to eat your fill of good, healthful food than to starve yourself or count calories.
Yes, yes, yes, and no! You are right that you should not starve yourself. You are also right that you should “eat your fill” of good, healthful food. The question is, what do you define as “your fill”? Pleasantly stuffed, or just “not hungry”? The best habits will have you eating smallish portions (relative to what’s typically given in the USA) 4-5 times a day, to the point where you’re not hungry but without that “full feeling”. You should not feel sleepy after a meal, and you should feel hungry again in 3-4 hours.
Also, for least for a period of a month or two, you should track your food and tabulate (yes, count) your calories. You gain weight by eating more food than you need to maintain your present weight. You lose weight by eating less and burning more calories. You stabilize/stay even by eating a maintenance level of calories. How will you know if you’re over or under if you don’t do the math? You don’t need to do this forever, but you do need to develop an intuition for approximately how “expensive” different foods are.
This really isn’t a big burden. Most people’s diet boils down to having the same menu options in different combinations, especially during the work week.
-I really, REALLY hate exercise. I hate getting up early, since I don’t sleep well anyway. I also resent giving up precious evenings to do something boring, painful, and sweaty.
The good news is, you can lose weight without increasing your exercise level too much. It’ll come off slower, and regular exercise is good for you in other ways, but if you count calories, that’ll do the bulk of the work.
On the other hand, you seem to think of exercise as a chore. I won’t try to convince you otherwise, about how once you get “into”, say, running, you get a high afterwards that makes it something you look forward to (though that is true). I will suggest instead to make it a non-optional part of your daily routine, something you do every morning (not evening – get it out of the way).
Make it a rule, for example, that you cannot take a shower, EVER, without doing as many consecutive good-form push-ups as you can manage without collapsing, followed by a pause of a couple of minutes, then doing as many crunches as you can without spasming. Your morning routine gets extended by 10 minutes or so at most: instead of brushing your teeth, undressing and hopping in the shower, first you do the push-ups, then you undress, then you do nekkid crunches, THEN you brush your teeth, THEN you hop in the shower. You can give yourself a break on weekends and just do this Mon-Fri, or on alternate days, but at least 4 times a week.
Keep track of how many your do to make sure you’re not coasting. You should be gradually doing more and more push-ups and crunches. You might start out only able to do 5 or 10 push-ups and 10-15 crunches. Give it 4 weeks and you’ll be doing 25 push-ups. It really does become easier, it doesn’t take long, you get a nice feeling of accomplishment watching the numbers go up.