I was very anxious and nervous before I started too. I’ve just done my 6th jab this morning.
So, as a relative newbie, I want to tell you it’s ok! Ok to be nervous, ok to read the leaflet ten times, ok to take a deep breath. And ok to take the medication.
Maybe don’t even set a target? See how it goes. See how you feel next week and the week after that. Next month. You don’t have to set a target.
Have you decided whether to calorie count or use a smaller plate or whatever you choose to do to reduce the food intake?
And yes, the overall guidance that people lose 20% is a statistic but it’s an average. Some will lose more and some less. There will be outliers at both ends. And the evidence of this thread at least is that you could lose more than 20%. If that is what you want.
Deep breath. You can do it!