Injections

So I've been doing my Menopur injections since last Fri (6 powders a day since Weds!) and Cetrocide since Weds and as I thought I was getting good at it I now think not.  Pricked my finger twice!  Forgot to get air out twice (one of each).  Just how important is it to get the air out?  It's a big responsibility doing all this bit ourselves, as if we haven't got enough to stress about!    And the Cetrocide seems to leave a little lump in me for a few hours and feels funny to touch.  Anyone else encountered this?