If this is your first time feeding a frozen/thawed rodent here are some tips that helped me. After the mouse is thawed use a hair dryer to heat up the mouse's head. This will help your snake find it much easier! Prior to feeding your snake leave the mouse on top of the tank for 30 to 60 minutes as this will get your snake in feeding mode. If your snake is in a glass tank you will see him/her begin to flick their tongue and roam the cage. Use some tweezers or hemostats and grab the mouse by the tail or nap of the neck and move the mouse around the cage a bit so the snake thinks it's "alive". Once your snake strikes and constructs sit back and enjoy the show!
I know you didn't ask advice on how to feed but oh well......