They'll be sealed and sterile. Tbh I don't get mine from GBN as they are dirt cheap and easy to buy here. I also never want to worry about whether or not to take a chance if I think I've contaminated one. It gets binned if l so much as touch the needle where I shouldn't.

And yes, ask away. I'm not an expert but I'll help out with things l do know about and there's plenty of people here to help as well. Always be safe.

ps might be best to get answers to questions before you start