Displaying data in a form without a actualy UI query

[Milind W]

I want to create a screen that displays the logged in users data from the
person entity.
How do I get the person Id for the logged in user?
Where and when do I set the personId?
I tried to look at some of the contact profile screens but found those
hard to read and they seem to be based more on ftl which I understand is
no longer recommended for new stuff.
Thanks in Advance.
-Milind