Will it be a ‘yes’ when you propose to your girlfriend?

This one is way too obvious. Don’t just spend eternity planning up on how to propose to your girlfriend if you’re not sure if the answer’s going to be a soul stirring ‘Yes’. You should know this one. Firstly, because it will break your heart if it’s a No. Secondly, it is going to be very embarrassing!
You must have had those conversations with your girlfriend before, the ones that go along the lines of “how many babies do you want to have?”, “how do you think life could be when we get married?”, and a few more. Make sure it’s a surprise to your girlfriend, but also be certain that you wouldn’t be surprised by your girlfriend’s response.