Is your car key looking like this?
a small vice hammar and som cheep tools is all you need.
Step 1: The Tools
Small screw driver to pry open the key
Smal magnet to catch the lock that holds the key blade
A small vice
Tape to hold the key in the right position
Step 2: Disasembely
Pry open the key,
Take out the electronics (and put to the side)
Take out the key blade locking "spline"
Step 3: Back Together Again
first move the blade
use the pliers to press the locking pin in place
put the electronics bak in the new key
and just press it together