Hi Izzie, what lens are you going to be using? I do not use tubes, just a Macro lens, when you put tubes on it exaggerates camera shake and makes it even harder to hold the camera steady!
if I were you I would practice on flower heads or coins or similar, as for bugs I don't use any of the methods you mentioned, I just go out and hopefully find them, try and sneak up on them and hope they do not move or fly away
it can be very frustrating but also very rewarding when you get a half decent image, be prepared for a lot more in the trash bin to start with
and keep away from wasps until you get the hang off things
looking forward to seeing your images