nice idea!!.
to clip it to a necklace is something I’ve never tried given the fact that I rarely wear any jewelry,I guess it’s time for a new look 
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My experiences in a big nutshell - 3 years, on MM 722, now with Dex for CGMS. Congrats on pumping! Wish I had started sooner!
- Usually about 3 days for changing reservoir. You will figure out your insulin needs, and then begin to fill the reservoir with about the amount needed to give you “3” days of coverage. Now, that can be 2.5 to 4.5 days. If you begin to notice into the 3rd/4th day that a normal bolus is not taking care of carbs or you are having to correct for highs that are not normal, then you can assume the insulin is no longer as effective or the site has become compromised. So I have figured out how to use it all up before I change reservoirs and sites, meaning when you look at the screen you see dashes for insulin remaining (I was told about 10 units are left at this point in time).
- Tubing - personal choice. Call MM, tell them you want to sample sets/lengths - they have been very good with sending out samples for you to use.
- Yes, you can soak to your hearts content. The site, not the pump! I spent last summer at a waterpark, pump in a Aquapac, and had to use skin-tac and mastisol on the sites to keep them glued, but no problems. At home, I don’t even put the little cover on the quickset when I disconnect anymore. And for a standard shower, I do not worry about suspending the pump or adding insulin, but again, what works for you may be a little different.
- Priming - let the insulin be at or close to room temp (you can use refrigerated, but tendency to get air bubbles is greater). Do not inject air into the bottle of insulin, draw insulin out into reservoir slowly, really slowly. Go past the mark you want to fill to, push excess back into bottle. Keep reservoir upright, hook up tubing, put reservoir into pump and have pump upright (not laying down or sideways) with tubing reaching up to ceiling when you prime. Usually takes care of the bubbles. Make sure you see good drop out the end.
i question the comment about not injecting air!
From a site on insulin pump bubbles I found this info:
1.Use room temperature insulin . Cold insulin creates more bubbles.
2.Draw insulin into the cartridge slooowly.
3.Draw beyond your desired units and slowly push the plunger back up, forcing bubbles back into the vial.
4.Tap the OPPOSITE side of the cartridge across from the bubble. Yes. Weird, but every nurse and educator will tell you this works WAY better than actually abusing your fingernail and tapping the cartridge where you see the bubble. I’ve found this trick works best for me.
5.Tap using a ballpoint pen to avoid hurting your nail (although, if you use the tip directly above, you can probably dislodge that bubble within 1 to 2 flicks).
6. Ah yes, do remember to fill your insulin vial first with air. Flip the vial over before you start drawing down the plunger - the plunger might actually move down slowly by itself just from the pressure of the air in the vial.
7.If you’ve got a million or trillion …ok…just “a lot” of annoying teensy insulin pump bubbles, you can intentionally turn the vial upright, suck in a small dollop of air, flip over and try to amalgamate all the little air bubbles into the one big one (eg. roll the cartridge gently so the little bubbles come in contact with the big one) - then push the one big one back into the vial.
8. Fill the cartridge the night before and let it sit upright at room temperature - most of bubbles move to the top. The next morning, reattach the needle, place into upside down vial and inject insulin pump air bubble back into vial. Gently and SLOWLY pull back plunger to fill those few units with insulin.
The entire article is at:
Insulin Pump Bubbles