dont wory about it, it will all become crystal in your ground training. I deliberately did not look at anything boeing/aircraft related when I started the 737 technical you never know what garbage might get stuck in your head just coz you read it somewhere. Although on the other hand being prepared is all good too, take my advice and you will be all over the place!
you can check the naviational accuracy on the fix page of the fmc i believe. useing vor/dme