I don't like when i put that bag on,the heat on my face the limited vision and the tight feeling around my head,idk how to make it easier idk how to make it more comfortable idk how to make it less scary i keep putting the bag on and pulling it off within a minute it's terrifying
Your body is responding to the quickly rising levels of co2 inside the bag, it's a basic human instinct to react and flee from that situation. You will find the urge to breath to become unbearable and without a physical barrier you will probably find yourself ripping the bag of your head either consciously or unconsciously.
Without sedatives or some other way to hinder the body natural survival instincts, you will experience fear and panic while doing this method consciously.
Your best bet is removing the human equation and hinder yourself from responding to SI, maybe a tightly elastic around the bag and handcuffs you can't open. You will of course still experience the same panic and distress as before but this time you don't have a choice.
Not a particular peaceful method in my book.