I can only start fiddling with my computer if I know how to fiddle with my computer - the ability to do that doesn't happen simply by sitting at my computer using it in a generic way. In fact, I've used computers for many years, but I'm still crap at messing with things like fan settings.
I can change my car seat because there's a convenient little handle a chimpanzee could easily master. If I want to customise my car, I need to go to a garage because I know nothing about mechanics or bodywork, despite having driven extensively for many years.
So what do you do for a living? Hobbies, things you're good with? I'll use my brother as an example, he's a mechanic in general, more specifically a diesel mechanic, even more specifically he works on transmissions, after working with his car, not just in a generic way, but learning how it drives, the differences in his gear ratios, when it's best to shift to get the most power out of it, he went in and completely rebuilt his transmission so it would drive with HIS exact driving style in mind. In skyrim, say you're an adventurer, you rely on YOUR armour to help you survive, after working with and using that armour extensively, you realise that your pauldrons restrict some movement, assuming that you have a decent smithing skill(due to use), wouldn't you want to go and work on your armour? Not to increase how much protection it offers, but to reshape the pauldrons so that your arms have a bit more range of motion? If anyone else were to use it they might not notice it, but that's because it's been personalised BY you, FOR you, to help how it fits you in specific.