I have held all these guns and the XD, Ruger, and Glock felt the best.
You held four guns and three of them felt the best? Might want to see if you can narrow it down. All are good pistols. What's most important is what fits YOU best.
Welcome to the madhouse.
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness