help ? want to lose 10-20 lbs

I've lose 12 pounds so far and like you, I already ate somewhat healthy (although I drank soda...gave that up 2 months ago and it was the best decision EVER). Portion control was my main problem. I used to load up my plate and think that I was doing ok because it wasn't junk food. Now, I realize I was eating way too many calories. I've also started going to the gym 5 days a week and trying to do some yoga/strengthening exercises at home. If you can't get to the gym, grab an exercise video and do it. I think this is an individual thing, you have to figure out what made you gain in the first place and reverse that. Drinking water is a great start!!

I'm coming up on my first ten pounds, and I started at about 214, but I'm also almost 5'8, so I'm betting we have similar body composition.

The first week or so I let my MFP default goals guide me, but it set me at 1200 calories a day and to be honest, I had no idea what the hell I was doing. I read the forums, read up on the science and decided to figure out my numbers - my BMR and my TDEE, which are the two most important figures for weight loss. I set up my calorie goal based on that - for me, it's around 1500-1600 and still probably on the low side - and started working out 3-4 days a week. I got a heart rate monitor to track my calories burned, and now it's just a matter of tracking the numbers and maintaining a moderate deficit.

So far, it's working like a charm.

You have to figure out what works for you. What's your motivation? Are you a black/white rules kind of girl or can you follow moderate guidelines? I'm a little more black and white. I'm also 5'2 and used to weighed 170 at my heaviest 10yrs ago. I lost over 40lbs the first time I lost weight was while in sports in middle school, so I was constantly being pushed and couldn't snack. It's funny that 10yrs later I work the same way. I need a couple of set rules, but this time, it's about fitness.I gained some weight last winter and wanted to drop from around 140 to the best weight of my life. I made myself a rule a that I was going to workout 4hrs/week, with a good effort and keep calories around 1400. On a bad week, I'd do 3hrs and make up for it the next week. I've only missed one week and that was while travelling. I've lost about 15lbs, but my body is also completely transformed, so even though I'd like to have seen the scale move more, I'm satisfied where I'm at.
So, my advice is if you're a black and white kind of person, *set a minimum requirement for yourself for workouts*. Don't procrastinate, if you do it at the beginning of the week, you don't have to later! I also included a rule that I wouldn't skip more than 2 days in a row. After a year, I've passed up that rule, but I never WANT to go more than a day without working out.
I work 50hrs/week. So, how did I find the time? I started by biking to work 1-2 days a week. I'd go for a walk if I didn't have time to get sweaty. It sounds like you don't have much equipment. Find some good core workouts to do some run/walks until you can run over a mile. It will hurt, but the day you can run over that hill, you'll feel GREAT!
Good luck!