2001 Xterra SE,
You have the gist of it.

However, as Uzbad mentions, there isn't really a need to undo the block drain plugs.

What I do is as follows:
1.drain coolant, have heater set to hot to allow heater core to drain.
2.open cooling system bleed valve
3.fill system with distilled water only
4.close bleed valve
5.run up to temp and then allow to cool down
6.drain system again (this is your flush...but only with distilled water)
7.open bleed valve
8.fill with 50/50 mix of coolant
9.close bleed valve

Now, what kind of coolant to use?

There were some discussions in the past about people using the Nissan coolant...something like $18 a gallon . Others have used regular Prestone without incident. When I change out my coolant in the near future, I'm going to use Zerex Extreme 5/150. This is because of it's formulation, which is silicate, borate and phosphate free...all bad things to have in engines that aren't cast iron.

Bogatyr