SALUTE
I have barely watched Breaking Bad
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Let's have another good week everyone 
Hey, I know anxiety isn't always rational (usually not, in fact), so what I'm about to say might not actually help you at all. Still though, I'm going to say it.
HRT injections are pretty idiot-proof. If they weren't, it wouldn't be so common for people to self-administer them. If injections were easily messed up and dangerous, quite a few of us would have weekly appointments at clinics to have professionals do them, but we don't. My sister didn't even get any training on how to do her injections, she was literally handed a pamphlet with instructions and diagrams and told "go for it".
Injections are absolutely scary, I don't like doing them, but I always remind myself that there's nothing that can go seriously wrong. Some weeks hurt (or bleed) more than others, but that's the extent of it. There's nothing I can do to actually cause injury or to cause the hormones to not work or something.
I'm glad to know the injection itself isn't dangerous. I don't know if you've read the other comments on this account, but this is a vial I brewed myself, so I think it does have quite a bit of potential to go wrong. I'm mostly worried that I'm injecting something I shouldn't be.
TBH this is a bigger fear than infection for me. But if anything, I'm probably injecting too much estrogen.
Ah, I had totally missed that you're injecting stuff you made yourself, that changes things! Your worry is more about what you're injecting than how you're injecting it, and for that, my response is extremely, entirely unhelpful. Well, I'm hoping for good things for you, hopefully in a few weeks you'll know that your hormones are working and you brewed them correctly!
No, it's still reassuring to know that I can't be delivering it wrong, at least. Thank you