Honestly, you'll be fine.
probably better than fine if you take a before and after photo. And you'll be here joking about it later.
if you want to whine you'll get lots of commiseration for better and worse here. It's understandable, it's just a join the club thing. Anyway, sounds normal for...
Seriously, you maybe fine but expect some PIP based on volume, inexperience and non-pharm source. It does get better, part of that is better at injections. The larger the quantity and the shorter the ester the tougher it will be, especially with inexperience and virgin muscle injection sites...
If you choose to do a double you can donate again in 16 weeks. Donation takes longer, have to hook you up to asphoresis machine to separate the RBC's, so also have to go to center that has it, might also want to have an appointment.
You double posted. Just go to pharmacy if you don't want it shipped. Depends on state though, if it's illegal I gave no idea. Clean injections are nothing to be ashamed of. You sound a bit like 12 year old buying condems.
if it's a problem, it's a problem because of your legislature. In most states just order them or buy OTC at pharmacy. Clean safe syringes are available and nothing to be ashamed of. Pick them up at pharmacy or order by the case http://www.shopmedvet.com/