Yeah, the hammer trick often works well, although I've never thought of doing it with two hammers - nice tip, I'll use that in the future
It may be worth doing the hammer thing before you apply the 3-in-1 (I'd go for the can of oil over the spray, you can usually get it from almost anywhere, wilco, halfords, asda whatever).
Personally I wouldnt be too bothered with counting the turns, once you have the rod-end moving just wind the nut back to where it was and use that as a guide - get your tracking set as soon as you have everything back together but before you add the 'thick' layer of copper-ease.
It's also well worth asking the person setting the tracking to try and balance up the lengths of rod at the ends ... often over sucessive tracking setting the rack will creep to one side or the other, the result is that when you turn in one direction you have more 'steer' than in the other.
By freeing up the nuts and rod-ends and cleaning the rods you make the person who is setting the tracking's life easier, as a result they are more likely to be able to balance up your steering and set it back in the middle again ;)