Ask HN: I want to build a share dealing company. How could I start?

I want to bring share dealing on the public markets (which is essentially buying and selling a small amount of a company you expect to do well) to people that are otherwise scared off by most stockbrokers intimidating use of terminology and ‘dealer’ focused user experiences.

Through what routes could I begin to trade on the behalf of others? How could I avoid long Know Your Customer practices? What are other barriers might exist, particularly in the UK?