Whirlybirdguy.
Your tone worries me. It sounds very 'un' technical and I suspect you have had very little if any formal mountain flying training - is that so?
If this is the case, nothing, no advice we give you will help because you will be completelty out of your depth as and when things go wrong.
Mountain flying is very unforgiving and as stated by RVDT, you could easily see yourself @ a Da of 10k and above.
Presumably your 412 is a semi rigid head? Whats the TRE like @ Hi DA?
Are you fully insured!!!