I’ve lost a stone over 4 weeks (5″10’/14 stone/36″ waist walking doughnut) without superhuman motivation/willpower/discipline etc. The best advice I would give is this: do not treat weight loss as a short-term goal. Think about it as a long-term change in your life as you will be able to maintain and build upon it.
Specifics don’t matter too much, pick a diet which doesn’t involve eating rats or giving up everything you love for a stick of kale, then pick a physical activity you don’t hate, make a decision to stick with it for at least two months and observe the results. As far as exercise is concerned I’ve found the best setting for me was going to classes, far easier having someone shout at you than trying to be your own drill sergeant. Hope this helps.