Hi Paul,
Don't worry, you'll get the hang of it eventually... though it might be a messy journey of tears and tantrums...
Steps 1-6, all good.
Next step is to "balance the drift". What you're basically trying to achieve is to have the drift line that your wind dot appears on reading the the same as the drift lined up with your desired track round the top of the wheel.
Really easy way to do this... Follow steps 1-6. Then slide the card to get your wind dot at the top of the graph paper, and draw a line vertically downwards from your wind dot. Now slide back up to where you were with the central dot over 100kts TAS. Now turn the wheel until the line you've just drawn parallels the drift lines. You should end up with the wind dot showing 13 deg port drift. Look up at the top and you'll see your desired track of 170 magically lined up against 13 deg port drift, giving you a heading to fly of about 184 deg.
Not sure if I explained that too clearly, but hope it helps!