SIMPLE IRA at Vanguard to be used as a Self Directed IRA

[Demetri T.]

There are so many posts here that I don't find myself asking to many questions...  This may be answered elsewhere but I am having trouble figuring out the thought process with it before I head to my CPA.  There is a lot of information out there so I guess I am just looking for some initial information- like a get started kind of thing.

I have been self employed for some time- I have a SIMPLE IRA. My wife has a traditional IRA and both are held at Vanguard. I am thinking of making these self directed- and using them to buy more property.

Does anyone know if I can use Vanguard for this?  

Is there a way to invest in the same property with my SIMPLE and my wife's traditional?

Is there a guide somewhere on BP to look into how to get started with this process?