It really isn't hard.
First, locate a drum key, then loosen your tension rods ( square shaped screws on the hoop for the drum)
Then, loosen the rods in a star pattern or criss-cross (loosening one, then go to the rod directly across that one and loosen it)
Loosen until the rods are no longer holding the hoop in place.
Now, pick up the hoop off of the drum with the tension rods attached to it.
Next, pick up the head by the rim. It should be off the drum now.
Now, put your new heads in the spot of the old one and put the hoop back on.
make sure the tension rods are lined up with the lugs that are on the drum.
Now, using the drum key, tighten the screws into the lug in the same criss-cross pattern. Until they are tight. Now repeat with the other drums, and you got new heads!
Good Luck, and have fun playing!
