I saw someone with a very cool quote under their ticker. It said something like: I can't lose 100 lbs., but I can lose 10 lbs., 10 times."
For me, calorie counting is the best because there are no off limits foods....just portion control. You also quickly realize that you get a lot fuller by eating whole foods. It can sound overwhelming, but I use LoseIt on my iPhone. Also, some people like SparkPeople.com and there are others out there (you can ask on the calorie counting board here).
Keep in mind that it's not about motivation but more about consistency. Your motivation can come and go but your consistency needs to be...well...consistent.
If you fall off track (and most people do), get right back on as quickly as possible.
Also, I know you've set up a time limit of one year, but don't stress yourself out over the time it takes. Things happen in life but overall, if you follow your plan and stay on track 90% of the time, you should get to your goal. A lot of people give up because they don't see the weight loss going down the way they expect. The scale can be tricky due to water fluctuations. I highly recommend taking photos so you can see the transformation. Maybe do a photo every 10 lbs. you lose? It's up to you. Try to wear the same thing and be in the same position and lighting. Also you can use measurements to let you know how you're doing.
Visit here often and make small changes and that will all end up with a lot. For specific advice, you might want to post a sample menu and people can help you tweak it. One easy way to cut down on calories would be to not drink your calories. That means no soda and no juices. Another would be to drink more water. Another change could be to include protein at every meal (in order to regulate blood sugar so that you're fuller longer)...another would be to eat high fiber (again, fuller longer). Another would be to get a cheap pedometer and walk more every day and aim for 10,000 steps a day or even more. I could go on and on.
The point is to head in the right direction and do it in a way that you can keep it forever and make it your lifestyle. Best of luck to you Starchild!