Something that's recently struck me:

Ignorance often makes it easier to do things, because you don't know enough to become paralyzed with indecision.

If I'd known what I now know about bicycles when I bought my bike, I might never got it. Back then I just went to a local bike shop a co-worker liked with the determination to stop delaying and get a bike that was neither too cheap nor too expensive. These days I would probably be trying to make up my mind about various bits of gear and what was best and how much I was willing to spend on what and so on.

It pops up a lot in computers, too. For example, now that I've heard about 6-bit versus 8-bit LCD colour issues and TN panels versus VA and IPS panels and a bunch of the complexity lurking under the surface, I am filled with a moderately vast uncertainty over future LCD panels, as opposed to the blithe confidence I had back when I said 'Dell 1907FPs, they seem good to me'.

(I suppose that this is a facet of The Paradox of Choice, which I must have read about at some point in the past few years.)