Pre-hospital Amputation thankfully doesn't happen very often. When it does there isn't likely to be time to google it....
Thinking the procedure through and getting to know the equipment is essential to keeping a cool head when the adrenaline is pumping.
PHEMCast have put together a great podcast which can guide you through the procedure and get you started.
Check out the website for other PHEM podcasts or subscribe on your podcast manager.