@MeiChanski you won’t need your dear friend tresiba with a pump. It’s fast acting all the time with a pump.
But tresiba will still be your friend. As a backup. So make sure he’s still in date waiting for you in the fridge.
As for where to put your cannula, I found there was a bit of trial and error to find the ideal sites (you definitely need a few to avoid Lipo-wotsit). I found it depends a bit on what I am wearing: spare tyre is pretty good unless I am wearing higher waisted troos.
And don’t forget you can put your cannula above your waist. With a tubey pump, you have more options because the cannula is pretty flat.