You don't necessarily have to be a security expert to use Bitcoins, just if you want to run the client by yourself.
If you don't have the required knowledge just pay a little bit to a "Bitcoin bank" that handles the task for you. In the real world you also don't carry your money with you all the time, but store it on a bank.
Banking eradicates many of the supposed gains of decentralized money - not all, but most. I just dig a quick Google for "benefits of Bitcoin" and it seems most people agree on the following:
- Anonymity/trackability. Gone if you are with a bank. Sure, possible to sidestep by going through the song-and-dance that is withdraw-send-deposit. We can do this IRL also, but there's a reason people do not.
- Taxability. Welp, if your BTCs are in a bank, the IRS can easily get you.
- Abusive/coercisve government action (e.g., freezing). Well, yeah, if you're with a bank that can happen too.
- Lack of fees. If banks become standard (and if BTC takes off, yes, they will become standard) then kiss goodbye to this benefit - the same way cash right now has no transaction fee, but bank transactions do.
In fact, the only major sell of Bitcoin that remains:
- Inability for government to arbitrarily expand the supply of money.
Still a win, but suddenly Bitcoins have lost a lot of charm, especially for the everyman for whom the above 4 points are much more salient than that last one.
If you don't have the required knowledge just pay a little bit to a "Bitcoin bank" that handles the task for you. In the real world you also don't carry your money with you all the time, but store it on a bank.