Same here. I've done it four or five times and it seems pretty straight forward. I do remember though that the first time it did the complete job I was listening to OWC Larry's tutorial on my MBP and shaking in my boots at the same time!
Having worked on a lot of computers I wasn't shaking on this model. Mostly the last model had me worried a bit with using a putty knife! This last model was a breeze compared to before