Gosh PP are so rude sometimes. I don’t see why OP should expect to be roasted because she has been in a privileged position. Jealousy doesn’t look good on anyone!
OP, I’m pleased for you that you have the income that you do! I can understand feeling daunted by this task. Money/budgeting feel like big, scary concepts, but there is a lot of help available. You’ve have some brilliant advice here already.
I know you’re not in debt (or you haven’t said you are) but I would recommend doing a course run by a charity such as CAP. It’s a brilliant resource to learn about budgeting in a friendly, non-judgmental environment, and we have found it very helpful in the past.
Excel is your friend! Definitely use this to list all your expenditure and projected budgeting.
It sounds like you need to allocate some money every month to savings so you leave your investments alone. As another PP said, go through your direct debits etc and list them, but budget 1.2x the amount. You are saving for the next annual fee, which is likely to cost more than this year’s. Also add in savings for a holiday, for house repairs, car repairs, etc. As you’re concerned about being the sole breadwinner, you could also allocate some savings to cover your mortgage/bills “just in case” something happens with your job or your DH’s job doesn’t happen in the next year.
We allocate ourselves a pot of personal spending money and personal saving money (for us it’s £50pcm each, which doesn't go far, so you have to be quite ‘on it’ with looking ahead, which you absolutely get used to) so that we can get ourselves coffees/etc guilt free, and save for presents or bigger purchases, but when it’s gone, it’s gone.
You’ve been living without a budget so far and you’ll probably find that, once you’re ripped off the proverbial budgeting plaster, you’ll feel much better about your finances overall! All the best.