Blossomgirl,
You are asking great questions! I am pretty sure that you can get a lot of information from the manufacturer's website. Google "humira," and ONLY look at the official patient website to get information. As I bet you know, there is a lot of un-useful, confusing information on the internet.

I do remember using the official patient website. I think there is a phone number or a chat link that patients can use to talk to nurses and trained people.

I'm pretty sure that there are videos on their website about how to give yourself the shot.

This Mayo clinic patient site is monitored by volunteers for "bad" information, so this is a pretty safe place to get information. But remember that even here, the people who post are not doctors. Be careful out there on the internet. Only use good sources, like Mayo Clinic.