Well, it's mostly finished but I did a lot more than I started out to do. And yes I was careful with the fan blades. I did let them spin but I always watch them close and listen to them, when they get going pretty well I stop blowing on them. Then when they stop I blow them in the opposite direction. I always do that with the power supply, cpu cooler, and graphics card.
When I blew out my computer it was really bad so I decided to do our server too since it sits next to my computer and hadn't been cleaned for longer than my computer, probably another year. And it's a good thing I blew it out it was way worse than my computer. Then since both of them are at the same desk and the two UPSes are there too I disconnected everything and cleaned that area too. So I've been a cleaning fool all afternoon. But at least things are clean now and everything worked fine when I turned them on. (my computer and our server)