Ax01 has got you covered.
Feed in the enclosure that your snake lives in. Don't remove it to feed. If feeding pre-killed for Frozen-Thawed (FT), I suggest using some tongs or hemostats if you have them. The first time you feed, if this is your first snake, it's going to startle you a little bit when the snake strikes. They are very surprisingly fast and will bite and coil that prey in the blink of an eye. Once you see it, you'll want to see it again. lol.
Just make sure the prey is thawed (it will feel soft/squishy) and is warm to the touch. IF feeding frozen/thawed, you can put the prey in a Ziploc bag and set in in the room for 6 hours or so and it will thaw out, or you can put it in a sandwich baggie and submerge it in luke warm water for a half hour or so. You may have to dump the water and add more warm after 10 minutes. The sides/belly of the prey should be soft and squishy. After it's thawed, I put mine in a sandwich baggie and submerge the baggie in a bowl of the hottest water I can get from the kitchen sink. I leave it in there for about 2 minutes and then remove it from the water, take the rat out of the bag and give it to the snake. If using tongs, hold the mouse/rat by its back, and just put it about 6"-8" out in front of your snake and hold it there. It will take it a second to catch the scent and heat signature, then it will likely strike. Once it does, remove the tongs and let it do it's thing. I try to slowly remove myself from the enclosure so I don't startle it or anything.
DO NOT heat in a microwave, and don't try to heat/thaw too fast. If you do, the belly of the prey will likely rupture and make a mess. It's gross. lol.