I did this. Took me about 1 hour. The iopener required more than 30s for me to heat up, but I got it done. My macbook was damaged because of a wine spill. Not sure how the battery got damaged as a result, as there appeared to be no liquid there, but... That was it.
Also, a bunch of the steps are not necessary, if you are careful. You do need to get the speakers out, but you don't need to do some of the other stuff. I skipped 7-12 and 15, instead folding over the speakers carefully, without detaching them.