You could definitely go that route, but it will take a lot of time. If you are looking for that just put together shiny new PC look where everything is absolutely spotless, your way might be the only way to go.
I am pretty OCD about my computer with regards to dust, and I use this for everything: http://www.amazon.com/Metro-Vacuum-ED500-500-Watt-Electric/dp/B001J4ZOAW
It is awesome, but it is very powerful. When cleaning fans, I keep a distance and keep the blades from spinning to prevent damage to the motor. 99.9% of all dust is blown into the next county. My PC looks pretty much new, but some things still have that almost microscopic dust that sticks like glue (like on the HDDs), but I never wanted to spend the time to go further since it'll get dirty again. If you want to go that little extra step and go crazy, then you could bust out the swabs and alcohol.
Since you already purchased your items, go your route, and if it's not for you, consider the data vac.