How do I start?

I must be doing something wrong because this feels impossible. I understand the concept but how do I resist the cravings? I either wake up starving or I’m good for half a day and then cave in or I’m good for almost a whole day and then give in my bad self at night. How do you guys do it?

Edit to update: THANK YOU ALL for all the advice and encouragement! They really helped and it got easier! I lost a little over 4 pounds so far and I feel so much better! My clothes fit better and I have more energy! Couldn’t have done it without y’all, thank you all again!