I might be interested in playing a character that is just as bad with technology as Harry, or even worse, in order to emphasize their focus on magic, supernatural powers, and non-tech skills. I assume I'm going to follow PP's advice to make the wizards' trouble with tech an individually variable thing rather than a function of the wizard's age. So I suppose giving a 'Technology Jinx' Aspect to such a character might be appropriate. How is like to live with that kind of curse? I have not read the books, so I don't know how Harry deals with it.
Harry doesn't have a hot water heater, so his showers are always cold. For heat and light, he relies on a fireplace and candles in his basement apartment. He's got an old Mickey Mouse alarm clock that seems to work well enough. He has no television, nor any other handy electronics. He's got an old house phone that's mostly reliable, although it sometimes suffers from inconvenient static. He's got an ice box for his cold storage, although I can't recall if it's a plug-in or if it's a literal ice box which he has to refill regularly; I think the latter, actually. He drives an old Volkswagon Beetle that breaks down a lot, which he bought specifically because his mechanic said it's easy to fix and find parts for.
As for his interaction with electronics in public, the impact on technology is often increased depending on his nerves. He was on a television set once, and the lights and electronics shorted when he got nervous. He'd attempted casting a containment spell to try and hold back the Murphyonic Field, but it wasn't very good, and only made things worse when it eventually failed. Other people's cell phones can have trouble if he's near them. He's got a policy with two friends to give them warning before entering their offices/rooms, to give them time to power off their electronics to try and avoid breakdowns. When he hasn't, computers have started smoking.
If he rides in other peoples' modern cars, the more advanced tech like navigation systems tend to fail first, followed by the rest. He used to avoid elevators, but hasn't seemed to bother with that since the early days. He uses a boat on occasion, but it's an older one that someone else maintains. He avoids planes, and if long distance travel is required, it's via car or train, if not via travel through the Never-never on foot.
At least one practitioner has shown a curiosity in how technology works because of the Murphyonic field, but there's been no sign that a mortal has been able to overcome the issue. At least one practitioner has more modern items in their home, but those may have been warded and shielded by supernatural creatures known for their magical craftsmanship. Such workings are extremely expensive, and the practitioner in question came about theirs by fortunate circumstances that mitigated the costs.
As for practitioners compensating for technology, there's not much. Rather than using computers to store information, they tend to write things down in grimoires. Those that have access to Spirits of Intellect, supernatural beings that have incredibly good memories and are loyal to whoever possesses them, will use those as lab assistants. In one of the later books, a magical item was introduced that allowed practitioners to not only speak with each other remotely, but it allowed them to hold an audio/video conference call in their heads. It's unknown just how commonplace that magical item is, but it doesn't seem to be available to the masses yet. There have been scenes in other locations where practitioners seem to be using a magically crafted lighting system that illuminates large areas without the benefit of electricity.
