GE ELECTRIC RANGE JB710 SELF CLEANING RADIANT

HELLO I PURCHASED A GE ELECTRIC RANGE JB710, THE BOTTOM ELEMENT STARTED TO FLAME AND BURNED OUT. THEN SOME WEEKS LATER THE TOP ELEMENT DID THE SAME. EVERYTHING ON THE TOP OF THE OVEN IS WORKING OK ONLY WHEN ALL 4 BURNERS ARE ON THE BACK PANEL GETS HOT. WHEN CHANGING THE ELEMENTS IS THERE ANYTHING ELSE I MUST PURCHASE? IS THIS A PRETTY EASY JOB TO REPLACE BOTH OF THE OVEN ELEMENTS.. MY STOVE IS 3 YEARS OLD .. THANK YOU