Ok, today I got the nitrogen bottle, it was about $100 for 40 (liters?).
The regulator is high side is 0-4000 psi, low side 0-200 PSI. Is this
enough, or do I need to exchange that, and what pressure is required?
Standard pressure hoses, as I am sure you are aware, are only good
up to 200psi.

Seems it takes 200-300 psi. to open the schrader...
What plane you have?
Kent