I never took Imuran. I take Humira though. For Humira, I'd suggest you to ask for the pens instead of syringe. Well, I may aswell suggest you to try both at your first injection session. Technically you will get 4 of them on the first week. You may ask to try 2 of each. I like the pen better because I don't see the needle and you can kinda not think about what you are doing as the pen does it for you.
I would suggest you to take your pens/syringue out 15 minutes before injecting (cause the colder they are, the most they sting - Though, they can't stay out very much longer than 15-20 minutes to maintain their efficiency.) Also, you can put an ice cube on the injecting site before you disinfect the skin and do the injection, it reduce the sting too.
If you can, do them on a day you don't have much to do. I get tired when I inject myself so I find easier to do them at night on the weekend. I usually chose saturday night before going to bed so if I get to be tired, it happens on sunday and I'm usually fine by monday.
Stay away from people with flus, cold, viruses, as much as you can. At the same time, I have to say I haven't had major issues with them. I have been taking humira for a year now, I did get a mini-gastroenteritis (which I never usually get but my bf had it so it was hard to avoid), and I caught colds a few times. But seriously, I think they make it sounds worst than. But it's much better to be safe than sorry right?! Therefore, for viruses as well as possible side effects, always keep an eye on them and report any you could have to your doctor. Humira is a wonderful drug when it works but it influences a lot in your body so just be cautious and talk to your doctor if you have skin issues, or articulation issues because they are highly related.
Hopefully, it will do wonders for you. Good luck