an]I also think that step 7-9 can be skipped.
If changing the battery, yes, but not if changing the hard drive, as these instr are also a part of. The pic in 7b r.e. bumper tab orientation is very important.
Better still is to print out these instructions. Then as you remove screws, scotch tape them to the instruction sheet right on the place where it says to remove them. The tape keeps them from getting lost and the order can't be screwed up.