Firstly well done on buying the book, to me it is like a Bible for modern living and I carry it in my 'man bag' wherever I go. I use it as a point of reference and to just read bits when I need that psychological reassurance that I am on the right track.
I too was vastly overweight and tried a few fad low calorie diets. I had great success with these but always piled on the pounds once I finished, for me it was sweets. The sugar cravings would just ruin me!
What changed everything for me was a total change in perception, I am a 90% primal guy, I don't eat any grains, potatoes, bread, pasta or sugar ( artificial). I eat a lot of raw veg, fruit, nuts and meat and have totally abandoned the routine of eating times. Most people I know think I'm bonkers but frankly I have never felt better, or looked better. As a few people on here will tell you, you don't have to preach to friends and colleagues about a caveman lifestyle they will quickly see how better you look and feel.
One tip that I have for you is to try and monitor daily your activity, the best thing I got recently was a fitbit flex. I have daily walking and step goals that I adhere to strictly, I try and walk at least 8 miles every day and apart from giving you a huge amount of 'me' time it mentally makes you much happier. I live in the country and really enjoy getting the fresh air.
With regards to the sport you watch, don't at all fell guilty about this, even GROK sat down for a couple of hours rest every day.. Just enjoy yourself!
All the best