I didn't see anyone else mention this so here goes... Because of my fibromyalgia and rheumatoid arthritis I knew I couldn't just take up an intensive work out regimen so I started eating less at meals. I'd also saw online someone suggested not eating after 7pm. I was inspired by that and knew I could do that too so figured I'd try it. I honestly think that is a big part of my (mostly) steady weight loss. No more popcorn or snacks at night while watching tv for me.
I also splurge a little bit and have a no-no treat on occasion. Like a favorite candy bar. When I did diets before I was very strict about not eating any candy or having a much treasured Iced Cappucino from Timmy Ho's once in a while. But it never failed that I would miss my favorite treats and at some point I would start eating a lot of it to make up for denying myself for months and, of course, then I was back to gaining weight in a flash and would inevitably give up on the diet.

This time I decided I would allow it on occasion and not feel guilty about it because I felt an occasional treat would help me continue my weight loss for longer and not just give up. So far it's worked for me. This is the longest amount of time I've successfully stayed on a diet.
For me... Lots of little changes in how and what I eat have added up to a large weight loss and I'm still going. I'm always eager to learn new tips from others and incorporate their suggestions into my own regimen.
Good Luck!!

Jesslan
PS Setting a goal weight is very important. It just occurred to me that in all the dieting I've done in my life I never set a goal weight. All I had in my was 'I want to be skinny.' I had no clue what weight would be realistic for my tall, big boned (Thanks Grandpa! LOL) body. This time I asked my Dr what would be a good weight for my body type. He said 180 lbs, but that sounded a little to 'big' for me. So I decided to try for 150 lbs. Then I found a BMI calculator online and it said for my height I should be 160 lbs. So that's what I finally decided. My Dr's suggestion may have been right and I'll find out when I get to 180, but until then I'll strive for 160 lbs.