Start right now, don't plan for it tomorrow or next week, you don't need to get anything to make it happen, you already have what you need.
So have you had your dinner yet? If not what are you having, is it a healthy meal or could you make a couple of small changes to make it healthier?
After kids are in bed, what can you do to occupy yourself so you don't just eat out of habit? If you don't have anything that you want to do, do you have some carrots in the fridge you could chop up to snack on?
Have you had much water today? If not, go fill up a glass and get sipping.
I'm 4 months in to my healthy living change, have lost 3 stone, gone from obese to overweight and from a size 22 to 16-18.
I accidentally fell into Intermittent Fasting because I don't eat breakfast, and I reduced but didn't completely cut out carbs. I have PCOS so carbs have always been a problem for me. I stick to around 1500 calories a day, log everything I eat in MyFitnessPal and do at least 3 lots of exercise a week, sometimes walking, sometimes walk/jog, sometimes a free video on OurParks (couch to fitness).
Once I got past the first 3 days it has been relatively easy. The first 3 days were hard as my body was craving the sugar so I felt ravenously hungry all the time. Then it just stopped and I felt good.