Hi and welcome to the site,don't take this wrong but when I first read your post i thought a second year Apprentice approaching his third year should be able to mark a rod and a door in a lot less time than nine hours.
Reading this thread and the other one you`v started it is clear that you are not an Apprentice but a pre Apprentice.So forgive me.
As you yourself and others have pointed out practice makes perfect,A old saying "no master ever fell from the Heavens" in other words practice,practice,practice.
Its up to you to use your time at collage to start to understand the technical side of the trade.It seems to me you are having problems with the rod(and I could be wrong again).
The rod is your template and all information should be on that rod, in theory any carpenter should be able to pick up your rod and after reading it be able to start to lay the job out.
The guy that taught me to mark templates out did it like this ,you are going to make the template but the man who will lay it out is on the other side of the world ,and there is no way he can ask you questions on it, so all information should be on the template.
If you feel that a point requires additional information then add a note on the rod pointing this out.Don`t be a butter fly Jumping from one point to an other, understand each point be fore you move on to the next,if your don't understand ask the Lecturer that is what he is there for.
Never forget there is no such thing as a stupid question but what is stupid is the question you never asked.If you do take up the trade there will be times when you will be asked to mark out some very complicated jobs. Never be overawed by a job a couple of saying come to mind.
How do you eat a elephant one bite at a time.
Never let standing wood hold you,you can do anything you like with that wood it can only do one thing with you,and that's make you look stupid if you let it.
Good luck with the collage and enjoy your journey.