He did show me how - it's just so difficult to get her to open her mouth - basically the tube was soldered (I think he said) at the end to make it nice and smooth - then it has to go all the way down almost - makes me think she'll choke on it! The only good herp vet here is an hour away and this needs to be done every 24 hours - it would cost £25 per day ($30?) to keep her hospitalized all this time so having successfully done the injections myself I thought I would continue doing this myself (I'd prefer the injections though).

The tube does have to go all the way down doesn't it? It's difficult to know exactly but it seems to be going OK - just the opening the mouth part :/

So that I know - where would I have to put it to get it into the oesophagus (so I can steer well clear of that) - and would I be immediately aware I'd done something wrong? (i.e. she chokes). I am putting it down centrally (wish I could phone vet now but he is shut with the holiday ...)