The occasional ready meal isn’t going to kill you and providing you eat them in moderation they’re not going to pile on too much weight. However, if you get into the habit of eating one a night then you’re going to have problems.
Now I understand that cooking is never going to be for everyone but I think there’s a lot of fun to be had in cooking a meal for yourself and a lot more satisfaction to be had while you’re eating it. It’s important that you try and cook at least some of your meals yourself as that way you’ll be able to monitor exactly what goes into them and regulate your intake. Losing weight isn’t that difficult providing you’re careful about what you eat.
If you cook yourself a meal remember to savour it. You took a long time to eat it so you should enjoy it when it’s there. You’ll find you’ll eat less if you eat slow as a lot of overeating is caused when people eat very quickly and their bodies don’t have the ‘full’ impulse quickly enough to prevent it. Slower eating means this impulse has a lot longer to reach you and you’re less likely to overeat.