I'm 6'5", went from 235+ to 180 in about 6 months, so you should be able to make your goal. Here's what worked for me. This isn't meant to be advice, just what I did, and I still am having some issues (just posted in a thread about how to get stronger and lose the rest of my love handles) but maybe it will give you some ideas.
I didn't "diet" at least in the sense of going along with some named program. I have a strong belief in eating traditional, natural foods, so I worked hard at that. Nothing processed, significantly lowered my intake of simple carbs like white breads, sugar, etc (even beer--just drank less of it), bumped up my intake of veggies, and ate more vegetarian meals in general (maximum 1 meat meal a day for me and often 0.).
A lot of this is more to do with my beliefs about the food system and health than dieting--I was already on board with a lot of this and was still fat. But really focusing on it and being able to say no to dessert and eating only until satiated (not full) helped. I was not crazy about tracking my eating. Mostly I ate any kind of food I wanted, other than processed foods or lots of sweets. The important thing I think is I realized I did not need so much food. Not every dinner had to be a big dinner, sometimes it could just be yogurt and fruit, maybe some nuts, or a quick salad with tuna or something.
Then I committed to exercising. Basically run every other day, and pushups on the off days. The running I did was mostly on a treadmill, using the hill program. Would jog the first 8 or so minutes and the last 5, walk on the flats and bump up the speed on the hills and go hard. Just 24-30 minutes. I started out jogging at 10 minute miles for the first 8 minutes and hitting the hills from 7.3-7.6 mph. Now I'm jogging at 8:15 minutes/mile and hitting the hills at 7.8-8.2 mph. I also mix in regular running either outside or on the treadmill. Started out doing 9+ minute miles for 2.5 or 2.75 miles, now I can whip out a 5k without too much trouble and do it at 8-830 minutes/mile. After a few weeks I really noticed my lung capacity increasing and the pounds started to fall off. The important thing to me felt like doing something every day. If I wasn't running, then at least I'd do some push-ups. And I ran every other day, maybe skipping a day here or there but was very consistent. For many people this is probably not very good performance, but I'm happy with what it's done for me and I am still improving. I was never an exercise nut so just doing it is a good step for me. Now I feel bad if I skip my day for running.
Anyway, I wish you luck. You will feel a lot better and a lot better about yourself if you get to a weight you are comfortable being at. You will also spend lots of money on new clothes so watch out (and waste some money too in those in-between periods if you lose a lot of weight). My driver's license has my weight from high school (180) and I never thought I'd get back to that. Now that I am, 12 years later, it's a good feeling.