I definitely understand your frustration with trial and error. You're then stuck wondering, "Is this a stall or am I just eating too many calories?" or "am I hungry because I'm eating too little or because of the food choices I'm making?" Unfortunately, I suspect it's a necessary evil if you want to reach that sweet spot of eating enough to feel satisfied for the long haul, yet paring down enough to lose weight.
I agree with others who say that 1200 seems low for a starting point. I'd be ravenous on that amount. I do 1500 calories a day and aside from a slight stall this past week (which I expected because I had a 2100-calorie Christmas Day and didn't watch sodium intake), I've lost well and felt great.
You might want to make a small investment in a food scale. It's easy to weigh your portions and it feels less...I don't know, less
dictatorial than measuring cups (which is weird because it's actually more accurate). For things like cereal and pasta, you just pop your empty bowl on the scale, hit the tare/zero button to zero it out, then add your serving to the bowl. Voila! And you don't even have to wash any extra measuring cups/spoons.
With calorie-dense foods like pasta, measuring or weighing portions is especially important. It's really easy to overdo; a 200-calorie serving of pasta is small compared to, say, a 200-calorie serving of grits/polenta or of spaghetti squash. The great thing about calorie counting is that you can have the pasta--but I've learned to make pasta an occasional thing because there're other less calorie-dense options to choose that'll take up more space on the plate.
Recipe calculators are great fun to play with and there are many of them to try. After a little while, you'll develop a good sense for how calorific stuff is; I find it fun to guesstimate, then plug in ingredients and see how close I was able to come. I'm getting noticeably better at the game the longer I'm counting calories.
