I only got some when I started to lose my hypo awareness. I kept it in the fridge for a while, then I thought, this is daft, it keeps for ages out of the fridge (can't remember exactly, but it says on the leaflet), so it's far more sensible to carry it around with me so it's available if anyone needs to use it on me. Having said that, I wouldn't take it if I'm just going to the post office or something, but it stays in my bedroom at night here and if I'm staying overnight anywhere else it comes with me. It lives in my Frio in the summer and spends the rest of the year in the (unchilled) coolbag in which I keep the rest of my insulin kit.
I must get R to do a practice with it when it goes out of date and needs to be replaced though, that's a good idea. I've never yet got him to inject me with insulin, though I've told him the theory for that and the diabetes nurse told him how to use the Glucagen. But an actual practice would be very sensible, if I can think of something for him to inject other than an orange (I'm allergic to citrus, so couldn't have an orange in the house with me).