If you look up the carb content of various foods you eat as a percentage of the weight, without the fibre, then you can try out various meals to see how they effect your blood glucose levels. You need to test your level just before starting to eat and then again two hours later. Any combination which raises your level more than two whole numbers is a bit carb heavy so you need to reduce the amounts or substitute something else.
Once you see that you can eat a particular meal and stay within the limit then you don't need to keep repeating the testing.
Count everything you eat.
It can help a lot to remove the densely carb foods from your diet entirely - such things as potato bread sweet fruits are usually too much to deal with - certainly early on, though as time goes on and levels fall that might change.