Base on my personal opinion.it is yes ordinary citizens can use bitcoin as long as they want to learn.and willing to give some time in this bitcoin.
Most of us are ordinary citizens, and only small percentage of bitcoin user are really tech savvy. With that said, all of us can use bitcoin and can transact using it. So I think there is no difference when it comes to using it, except if you are someone who can really affect the transactions, you will be a extraordinary.
Everything can be learned if you are willing and you really want to do it.