I've recently started pumping too. Having the libre alongside the pump has been invaluable and I've almost got my basal rate cracked now. I think it's just patience you need at first, when you've set yourself up for a basal rate test but you can't because your BG is too out of target and you have to correct is a pain
but I guess that's the same as MDI.
Go slowly, tweak one thing at a time, my consultant told me her friend who is a surgeon took 3 months to sort it out so if it took a clever bod like that 3 months well, I'm doing ok!
And I'm sure you will too.
Having a supportive DSN and this forum really helps. Good luck
I also found the official YouTube videos helpful when I first changed my cannula and infusion set. (I'm on a different pump to you though)