I just got my A license and I am by all means an infant in this sport. I just did my 35th jump yesterday. Personally I think it's a good thing that these things are going through your head. Emergency procedures are the most important part of this sport. In a crisis skydivers dont rise to the occasion they revert to the level of their training. So it sounds like you had a good trainer.
Almost every niight I fall asleep with the voice of my instructor talking about Line overs and bag lock, and realistically I am glad that this voice is there. I think that it is a testament to the training you are receiving. Stick with it, It only gets better from here.
--dave
"If god didn't intend for man to jump out of airplaines, s/he wouldn't have invented relative wind."