I'd also recommend PMcK (ICMYS) and regular exercise.
For me personally I, at 50 (old dog/new tricks), know there's no way I could stick to a faddy diet. By 'faddy', what I mean is 'something that's completely alien to my normal food'. (I couldn't be doing with different meals for me and the rest of the family, or calorie counting, or 'syns', or dropping entire food groups from my diet). This only works if you, like me, are merely a bit over-indulgent and greedy, and eat because the food's there and you're a bit bored; i.e. your diet is generally 'okay' just that you eat too much of it plus too many 'treats', and take minimal exercise. It won't work if you're an emotional eater who can only stop eating biscuits when the whole packet's gone, icecream when you've hoovered up 2 litres, chocolate when the family block and the DC's Easter eggs are all gone.
IMO opinion that requires a rethink about why you have such an emotional response to food. PMcK does deal with this in 'Emotional Eating' which I read on here is very good.
A good starting point is not necessarily to regard yourself as 'a revolting blob' as you might find yourself 'justifying' that by punishing yourself with more overeating.
Deciding that 'it's time to begin a new woe (way of eating) because I want to respect myself again' is a great start. 'I want to feel good about myself and I am worth the effort'. PMcK does some 'trance' stuff about visualisation where you 'see' the body shape you want to be and try and imprint this on your mind.
Sometimes, of course, it takes that' revolting blob' moment to kick us out of denial (how many of us had that Damascus moment upon viewing a holiday snap of ourselves? I did!) But from that moment on, make that 'your line in the sand', not your reference point for self loathing.
I have very little willpower either and can procrastinate for England, but once I decided I was good and ready to tackle my weight gain, I got stuck in. I've been at it since April 1st, so I'm no expert, but I've used PMcK's Mindful Eating technique (that's ICAMYS), I overdo it once or twice a week ( I do like a pinot grigio 
) but I'm mindful the rest of the week (and am finding my weight loss inspires me not to 'blow it' completely on one stupid evening's gorging); I fast walk on a treadmill (2 miles, 28 minutes) every evening that I can within reason as I know if I say to myself 'oh, Mondays, Weds, Thurs and say Saturday' I'll find a reason not to on at least one evening and thus it drops away. I do not enjoy exercise but it's become 'something I do' and I hate it a lot less than I used to! I also drink loads of water during the day.
Remember, there are no 'good' foods or 'bad' foods, there's just food, some of which has better nutritional value that other foods. By eating certain things or not, you are not 'being good' or 'being bad'. You have just exercised a choice at that moment. You decide what to eat and, crucially, when to stop.
I was 12/6 on April 1st, I'm now 11/9 so not a spectacular weight loss but it's heading in the right direction and it's a sustainable weight loss, brought about, I hope, by a re-education of my eating habits, not a crash-diet body-shock that will reverse the moment I go 'back to normal'.
Whatever you choose to do, you've taken the first step by recognising that 'it's time'. Good luck and keep posting on here.