Hi Lucie,
I have the vibe and use the inset ll, I've only once had a set problem and that was Christmas Day. I changed it and it stang a little bit, but that went of. A little later I tested and blood sugar had gone up, so I changed the set and it had bent at a right angle. That's the only problem I've had so far, but I've only been pumping a month.But as Kalobe said it should get easier as we practice. IHS I normally sit and do a set change, should I stand when I change as DSN hasn't told me not to sit.