Directives

Any legal folks in da haus?

After my dad's unexpected (and as of now, positive outcome) medical issues and one of my dear friends passing recently, I think I've (finally) come to the realization that I'm not getting any younger and need to line my ducks up. Besides, hearing about all the crazy stuff going on around the world and even more locally than that, it sounds like a smart idea.

I know both medical and financial "directives" are usually used to make the post-life decisions easier and faster transitions (see how I tied that back to triathlon?) for the next generations.

Can anyone suggest an affordable way to tackle those?
What does one suggest for legal documentation?  How formal do they have to be?
My dad has a trust set up (I'm a beneficiary as well as the executor), that SHOULD make the arrangements easier. Does that set-up benefit someone such as myself (single without kids) as well?

FYI, I'm in Texas (Dad is in California). I know that has to make a difference.

Serious advice appreciated.