Their website is complex, but they offer more than most brokers, i think its the best broker website currently available. Over time you will figure it out and become familiar. Show me another broker where you can open demo and live accounts in your own terminal within a minute and adjust settings etc.
Yes you have to provide a lot of details about yourself to setup terminal and pamm or investment accounts, heck life is a risk, just dont have all your funds in one bank account, have it in savings accounts, or other bank accounts that you tranfser to the account which is linked to your broker.
We are all faced with a series of great opportunities, brilliantly disguised as unsolvable problems - John W Gardener