Hi, So, tonight third time putting set on…Hated it on lower belly, got 3 no delivery beepings, medtronics wanted mre to pull it out and try again, didn t do that, started working again….got lucky…On thigh for first time and using 40 and not 23 inch tubing….So question, anyone use the plastic…c something,the part that shoots in with the inserter or do people use the metal needle at the cite…and how is is having the needle stay in you??Also when do I finally know how to use this pump well. Graduated pump school and watched the video, always forgetting a step or two.Stiil new, afraid pump will fly out, when do things become normal again….do not know if it ever were….many thanks….