I don't think you're being thick. Always best to ask if a post isn't clear!
As long as you calculate carbohydrate content, according to bean label and details of bread, then work out how much insulin to inject. As I mentioned, baked beans and their sauce can vary considerably in carbohydrate content, so it's important not to assume details from last time you ate baked beans.
The big advantage of basal bolus insulin regime is that you can eat what you want, when you want, as long as you have enough insulin. Many people regard higher carbohydrate meals as occasional treats, rather than regular occurences.