These key moments shape us academically, our Masters/PhD's etc - So they say.
To assist in taking the pressure off; remember that you may or may not use all or any of what you are building and completing now in your future career.
Just do the best you possibly can, it's up to you to decide how big or small of a part the end result plays in everything you do after completing it.
Remember to enjoy the little things, they keep us going.
This will be a memorable milestone for you, but we should never stop learning otherwise we'd stagnate or only go backward.
Most importantly, everyone here will see you in Disco Freelancer afterwards.
Good luck on the dissertation! Such things may seem and be daunting when you are doing them, but with effort and dedication I am sure you will find success!