Hi Chris,
I am doing quite well on Humira thanks.
I take 15mg mtx a week as well, they do say humira works better with some mtx added.
I've had humira in pen and syringe form and to be honest I prefer the syringe, I feel to have more control.
I didn't ever think I would be able to inject myself (even though I'm a nurse) but when the time comes you just get on with it, I quite surprised myself.
Good luck with the mtx, I'm sure you'll manage the injections.
Doreen xx