Just to add in to @mm2 's thoughtful response - I’m a type 1 diabetic on the TSlim and Dexcom.
I’ve been on a pump for 4 years now. Tandem / Dexcom are making great strides in enabling good control for a lot more people. The systems are getting more automated so day to day is pretty straightforward.
However, it is overwhelming as you get started - it’s a whole new set of protocols and equipment, and you have to learn new habits as well. Once you learn them, I think it will become quite natural for you – but the process of learning is hard and anxiety provoking.
You’ll get lots of support - Tandem has (or had) a bunch of peer consultants who are there for you - talking you through how to do things. Please let us know if that still happens, because it was quite useful to me to hear war stories from another t1 diabetic who had been on a pump for a long time.
As for something I wish I knew prior to the Tandem, I could have benefitted from a discussion about where you put the pump - in your pocket, in your underpants? Some women put it in their bra.
What is the nature of your anxiety? Is it about usage or something else?