Step 7 is easy just make sure you have the correct nut plate. One of the reasons I love my DVD buildhelp is that you can see what they do and compare.
Step 8 I had final drilled the holes in the counter balance brackets WD1222 & 23 but noticed that it was quiet hard to push the rivets in. I double checked I had the correct rivets, which I did so I drilled the holes again so that the rivets went in easily.
Using my rivet sizer I verified the sizze of the heads and I need to squeeze them a little more.