However I have very limited knowledge in this area.I know this can trigger the bank to call the note but has anyone had that happen?

Not all purchases and loans are perfect, and something can come up mid deal that will trigger your loan to be denied.  

I've considered them myself but I haven't been brave enough to pull the trigger on anything yet.

Is there any way to protect one's self in the event of a default on a seller finance note without triggering the original mortgage foreclosure process?

Frequent lurker but haven't pulled the trigger yet due to some other things in my life.

It would be great to get an idea so that when it comes I can pull the trigger withs one degree of confidence.

Since an LLC is an entity outside of yourself, I would imagine this would be considered a title/lien holder change, which could trigger the due-on-sale clause. 

David, a refi does not trigger a reassessment.  

I have always been interested in real estate, just never pulled the trigger until now.

I have been a lurker here on the forums for the past 6-7 months and I must say this site is one the best things I have ever encountered on the internet with vast knowledge and great people.I have recently decided to pull the trigger and "just do it".